Enhanced access control based on key proximity

ABSTRACT

Embodiments relate to enhanced access control features based on proximity between a portable electronic key and an electronic locking device. The portable electronic key receives first authentication information from an access administration device. Based on the portable electronic key being located within a threshold distance to the electronic locking device, the portable electronic key receives second authentication information from the access administration device. In some aspects, determining whether the key is located within the threshold distance to the electronic locking device comprises detecting a communication between the locking device and the portable electronic key. The portable electronic key may initiate an unlocking event at the electronic locking device based on the first authentication information and the second authentication information. Initiating the unlocking event comprises transmission of an access credential that causes the electronic locking device to permit access to an entry point.

RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/175,625 entitled “ELECTRONIC KEY DEVICE UTILIZING USER INPUT TOFACILITATE ACCESS BY AUTHORIZED PERSONS” and filed on Oct. 30, 2018, nowallowed, which is a continuation of U.S. patent application Ser. No.15/596,201 entitled “REMOTE ADMINISTRATION OF AN ELECTRONIC KEY TOFACILITATE USE BY AUTHORIZED PERSONS” and filed on May 16, 2017, nowU.S. Pat. No. 10,115,256 issued on Oct. 30, 2018, which is acontinuation-in-part of U.S. patent application Ser. No. 14/680,048entitled “APPARATUS AND METHOD FOR REMOTE ADMINISTRATION AND RECURRENTUPDATING OF CREDENTIALS IN AN ACCESS CONTROL SYSTEM” and filed on Apr.6, 2015, now U.S. Pat. No. 9,841,743 issued on Dec. 12, 2017, whichclaims the benefit of U.S. Provisional Pat. App. No. 61/975,911 entitled“APPARATUS AND METHODS FOR ELECTRONIC ACCESS CONTROL” and filed on Apr.7, 2014. The disclosures of the foregoing applications are incorporatedby reference herein in their entirety.

TECHNICAL FIELD

This disclosure relates to the field of access control, and, moreparticularly to an improved electronic key for use with an electroniclock in an access control system.

BACKGROUND INFORMATION

It has become commonplace in the broad field of access control for locksand keys to incorporate electronic components that control variousaspects of the locking and unlocking process. Indeed, the automobileindustry has long been familiar with keyless entry systems that utilizeelectronic components to control access to a vehicle.

In other areas of access control, for example securing areas of a largecommercial building wherein locks are installed on doors, cabinets, andother enclosures, it is desirable to replace traditional mechanical lockcylinders in an access control system with electronic orelectro-mechanical locks.

In access control systems incorporating electronic or electro-mechanicallocks, it is often advantageous to provide a system administrator orsystem user with the ability to monitor and/or control the operation ofelectronic locks from a computer station, for example by connecting theelectronic locks to a data network via a wireless local area network(WLAN) or a permanent hardwire connection. However, the costs associatedwith installing, connecting, and maintaining such a system may beprohibitive, particularly in a large or sprawling complex. Moreover, thelocation of certain locks may not be conducive to either form ofconnection. In addition to maintaining an adequate communicationsinfrastructure, dedicated administration software is generally requiredto manage the access control system. This software adds additional coststo the system and computer updates or hardware changes may cause systemmalfunctions.

SUMMARY

The following presents a simplified summary of various aspects of thisdisclosure. This summary is not an extensive overview of the variousembodiments and implementations described in this disclosure, and is notintended to identify key or critical elements or to delineate the scopeof the claims. The following summary merely presents some concepts ofthe disclosure in a simplified form as an introduction to thedescription below.

In general, various aspects of the subject matter described in thisdisclosure can facilitate administration of access control informationfor a portable electronic key in an access control system. Accesscontrol information can be provided to the portable electronic key toenable the key to perform one or more tasks. Access control informationmay comprise authentication information that facilitates initiation ofan unlocking event at an electronic locking device. In someimplementations, the authentication information is provided to theportable electronic key based on the key's proximity to the electroniclocking device. The portable electronic key may receive firstauthentication information and second authentication information. Insome aspects, the portable electronic key initiates delivery of anaccess credential for unlocking the electronic locking device based onthe first authentication information and the second authenticationinformation.

The portable electronic key can receive access control information froman access administration device. In some aspects, the portableelectronic key receives access control information comprisingauthentication information from a plurality of access administrationdevices. Access control information may comprise first authenticationinformation and second authentication information. Provision of at leasta portion of the authentication information can be based on proximitybetween the portable electronic key and the electronic locking device.The access administration device can provide at least a portion of theaccess control information to the portable electronic key via a wirelesscommunications network. In some implementations the wirelesscommunications network is a wireless local area network or a wirelesswide area network. In other aspects the wireless communications networkmay comprise a wireless personal area network, a wireless mesh network,and a wireless ad hoc network. The access administration device can beconfigured as a server computer. In some embodiments the accessadministration device is a mobile device, such as a smartphone, laptop,tablet, or wearable device. The authentication information may includetime and date information defining a time period during which theportable electronic key is permitted to initiate delivery of the accesscredential to the electronic locking device.

The details of one or more implementations of the various embodimentsare set forth in the accompanying drawings and the detailed descriptionbelow. Other potential implementations of the subject matter will beapparent from the description and drawings, and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of this disclosure, the drawingsherein illustrate examples of the various non-limiting andnon-exhaustive embodiments and implementations. The drawings, however,do not limit the scope of the disclosure.

FIG. 1 is a block diagram illustrating an example access control systemin accordance with various embodiments.

FIG. 2A is a block diagram illustrating an example portable electronickey in accordance with various embodiments.

FIG. 2B is a block diagram illustrating an example printed circuit boardwith functional components embedded thereon for use with a portableelectronic key in accordance with various embodiments.

FIG. 3 is a block diagram illustrating an example of communicationinterfaces between functional components of a portable electronic keyand further illustrating example communication interfaces between theportable electronic key and electronic devices located away from thekey.

FIG. 4 is a flowchart illustrating an example method for utilizing aconventional web browser on an electronic device to modify accesscontrol information of a portable electronic key.

FIG. 5 is a flowchart illustrating an example of an energy efficientmethod for establishing a wireless communications interface with aportable electronic key.

FIG. 6 is a block diagram illustrating example communications between aset of two or more portable electronic keys deployed in an accesscontrol system.

FIG. 7 is a flowchart illustrating an example method for automaticallyupdating access control information of a portable electronic keyconfigured to operate in a client-server relationship with a remoteserver device.

FIG. 8 is a block diagram illustrating an example access control systemin accordance with various embodiments.

FIG. 9 is a flowchart illustrating an example method for delivering anactivation signal to enable functionality of an electronic key inresponse to a user verification procedure executed at a mobile device.

DETAILED DESCRIPTION

In view of the difficulties and costs associated with facilitating theexchange and maintenance of access control information in an accesscontrol system, the present inventor recognized that there is a need forproviding remote monitoring and control of information associated withportable electronic keys deployed in an access control system.

As illustrated generally in FIG. 1, an access control system 100 used toselectively control access to an area(s), enclosure(s), or item(s)comprises at least one electronic locking device 110. Electronic lockingdevice 110 may be any locking device controlled, at least in part, byelectrical signals and capable of selectively locking an access point,enclosure, or otherwise selectively restricting access to an area oritem. Examples of various suitable electronic locking devices aredescribed in U.S. Pat. Nos. 5,140,317, 5,351,042, and 6,474,122, to namea few. According to various embodiments described herein, a portableelectronic key 10 communicates with electronic locking device 110 via abi-directional interface 112, for example to initiate an unlockingsequence or otherwise control operation of the locking device accordingto known methods.

Various methods and techniques for communicating with and/or controllingoperation of an electronic locking device are known in the field ofelectronic locks. One example of a reliable method is that described inthe aforementioned '122 patent assigned to Videx, Inc., assignee of thisdisclosure. As illustrated in greater detail in the '122 patent,operation and/or unlocking of an electronic locking device may beinitiated by transmitting information comprising a unique identificationcode and password, stored in memory of an electronic key, to theelectronic locking device. The electronic locking device may thencompare the received identification code and password against a list ofauthorized keys and passwords stored in memory of the electronic lockingdevice. If the transmitting key is indeed authorized to operate theelectronic locking device, and the transmitted password is accurate, theelectronic locking device may thereafter be opened. It will beappreciated that other known methods and techniques for operating anelectronic locking device may demand additional authentication variablesthat further restrict access, for example time and/or date constraintsthat limit the period during which a key is authorized to operate alock. In accordance with other suitable methods and techniques, theelectronic key may store a record of successful and/or unsuccessfulaccess events in memory of the electronic key and/or the electroniclocking device. As operation varies across access control systems,skilled persons will appreciate that the term “access event” refers toany event involving a component of access control system 100. Dependingon the arrangement and characteristics of access control system 100,access events may include such events as successfully unlocking anelectronic locking device, denying an electronic key access to anelectronic locking device, movement of an electronic key to a particulararea of an access control system, and transmitting certain accesscontrol information from one device to another, to illustrate just a fewpossible examples.

Skilled persons will appreciate that any one of the known methods andtechniques of operating and communicating with a suitable electroniclocking device may be employed by access control system 100.Accordingly, bi-directional interface 112 may be implemented as a wiredcommunications link, wireless communications link, or combinationsthereof utilizing any suitable communications protocols discussedherein. Methods of communicating with and/or operating an electroniclocking device via a wired communications link are disclosed for examplein U.S. Pat. Nos. 5,140,317 and 6,474,122 (described briefly above).Methods of communicating with and/or operating an electronic lockingdevice via a wireless communications link are disclosed for example inU.S. Pat. Nos. 5,815,557 and 7,334,443.

It is further appreciated by skilled persons that an electronic lockingdevice may be configured without access to a power source. In suchconfigurations, electrical power to energize circuitry of the electroniclocking device may be provided by a power source within an electronickey during an unlocking operation or during other key-to-lockcommunications. For example, electrical power may be supplied tocircuitry of an electronic lock during engagement with an electronic keyvia electrical contacts (where electrical contacts on an electronic keymay be electrically coupled with corresponding electrical contacts onthe electronic locking device) or by other known methods such asinductive coupling.

While access control system 100 may comprise any suitable electroniclocking device known to skilled persons, various embodiments of thisdisclosure are illustrated as comprising an electronic locking device(s)configured without access to a power source. Accordingly, bi-directionalinterface 112 is illustrated herein as a wired communications link (orcombination of wired and wireless) implemented such that portableelectronic key 10 may energize circuitry of electronic locking device110 according to known methods. As used herein with respect tobi-directional interface 112, the term “wired communications link”indicates that physical engagement (i.e. mechanical coupling) betweenportable electronic key 10 and electronic locking device 110 mayfacilitate the energizing of circuitry within electronic locking device110, for example via electrical contacts disposed on both key andlocking device. It will be understood that the term wired communicationslink is not intended to denote or require a permanent wired connectionbetween portable electronic key 10 and electronic locking device 110. Inaddition to energizing lock circuitry, in certain implementationsbi-directional interface 112 may be further utilized to electronicallytransmit information such as an access credential to electronic lockingdevice 110. However, it will be appreciated that bi-directionalinterface 112 may optionally be implemented according to other knownmethods, including for example as a wireless communications interfacethat may additionally accomplish energizing circuitry within electroniclocking device 110 via inductive coupling or other known methods ofwireless energy transfer.

In accordance with one or more embodiments of this disclosure, aportable electronic key for use in access control system 100 isillustrated generally at 10 in FIG. 2A. It will be understood that thisdisclosure also refers to “portable electronic key” as simply“electronic key” for brevity, and that the two terms may be usedinterchangeably. Electronic key 10 comprises a power supply 12 and aprinted circuit board (PCB) 14. Optionally, power supply 12 and/or PCB14 may be electrically coupled to one or more electrical contacts 15.Electrical contacts 15 are preferably disposed such that they areaccessible from the exterior of electronic key 10. Skilled persons willappreciate that the overall mechanical and electrical arrangement ofelectronic key 10 may be implemented as desired.

Referring also now to FIG. 2B, PCB 14 has embedded thereon, amicroprocessor 16 connected to a plurality of functional componentsincluding a wireless communications module 30 and flash memory 40.Additionally, the PCB may optionally have embedded thereon, andconnected to microprocessor 16, an accelerometer 42, a beeper 44, and anLED 46. Other functional components may be embedded on PCB 14 asdesired. Microprocessor 16 typically includes a clock 18 andnon-volatile memory 20 embedded thereon. Wireless communications module30 may utilize various known methods and protocols of wirelesscommunication including IEEE 802.11x, WI-FI DIRECT®, BLUETOOTH®,ZIGBEE®, NFC, and/or other wireless communication methods and protocolsknown to skilled persons.

Wireless communications module 30 is shown in FIG. 2B as comprising anembedded transceiver 32, but it will be understood that a transceiver orantenna may be provided in non-embedded configurations and operablyconnected thereto. It will further be understood that a plurality ofwireless communications modules may be included to provide electronickey 10 with wireless communications capabilities utilizing multiplemethods and protocols. Appropriate wireless communications modules maybe obtained commercially and include that sold under the model number“MRF24WBOMA” by Microchip Technology of Chandler, Ariz. It will beappreciated by skilled persons that other suitable wirelesscommunication circuitry may have utility in electronic key 10.

In addition to non-volatile memory 20 embedded on microprocessor 16,flash memory 40 of PCB 14 may be commercially available flash memory andaccording to some embodiments is configured to store access controlinformation, such as an audit trail (i.e. log of previous access events,such as details associated with opening of a locking device), accesscredential (e.g. key permissions, lock schedules, other variables,etc.), and other access control information utilized in theimplementation of various embodiments of access control system 100.While electronic key 10 is described herein as containing a plurality ofseparate memory units (non-volatile memory 20 embedded on microprocessor16 and flash memory 40), it will be understood that electronic key 10may utilize any appropriate arrangement of electronic memory sites tostore information including a single non-volatile memory unit.

Accelerometer 42 may be any device capable of measuring accelerationforces and may for example comprise a multi-axis accelerometer oralternatively, acceleration forces may be measured by a combination ofmultiple, single-axis accelerometers. Beeper 44 may be any audiosignaling device such as a piezoelectric buzzer and/or other audiosignaling devices known to skilled persons. Although FIG. 2B depicts theaforementioned functional components as embedded on PCB 14 and coupledto microprocessor 16, skilled persons will appreciate that in alternateembodiments and implementations, these components may be arrangedseparately from PCB 14 and operably associated with microprocessor 16utilizing known methods.

Referring to FIG. 3, non-volatile memory 20 (embedded on microprocessor16) comprises a software application(s) containing an event handler 22and a web server 24. While event handler 22 and web server 24 areillustrated as being disposed on the same memory unit, skilled personswill appreciate that event handler 22 and/or web server 24 may bedisposed on separate memory units such as flash memory 40. Further,while event handler 22 and web server 24 are illustrated herein asseparate software programs, skilled persons will appreciate that thisarrangement is illustrative only and that a single software program, ormany separate programs, may be configured to perform the variousfunctions of event handler 22 and web server 24. Event handler 22 may bea software program configured to receive, process, and respond to inputsignals from functional components operably associated withmicroprocessor 16 such as accelerometer 42. Further, event handler 22may be configured to receive, process, and respond to input signals frombi-directional interface 112 for example when electronic key 10 isengaged with electronic locking device 110 or with a recharging dock(not shown).

In accordance with some implementations, event handler 22 may respond tovarious forms of input by selectively controlling access to informationstored on electronic key 10, for example in flash memory 40. By way ofexample, event handler 22 may respond to an engagement event with anelectronic locking device 110 by performing an authentication action asdescribed in this disclosure (e.g. by comparing unique ID codes of bothkey and lock, etc.). As used herein, the term “engagement event” refersto electronic key 10 engaging, pairing, or otherwise communicating withelectronic locking device 110 (e.g. for the purpose of initiating anunlocking sequence or exchanging information). In this example, if eventhandler 22 determines that electronic key 10 is indeed authorized tooperate electronic locking device 110, event handler 22 may initiate anunlocking sequence according to known methods as described brieflyherein. For instance, in this implementation event handler 22 mayretrieve an access credential, such as a unique key ID code andpassword, stored in flash memory 40 and transmit this information toelectronic locking device 110 via bi-directional interface 112. It willbe appreciated that the term “access credential” refers to anyinformation that may be utilized by electronic locking device 110 and/orelectronic key 10 to authenticate access or operation and may includeinformation such as authorized time and date schedules (i.e. permissionsto access certain electronic locking devices at certain times),passwords, ID numbers, etc.

For example, while electronic locking device 110 may require electronickey 10 to possess the proper permissions (i.e. authorization) toinitiate an unlocking sequence of that particular locking device, it mayrequire additional information, such as a date/time variable that iscompared against a date/time range during which the electronic key 10 isauthorized to operate electronic locking device 110. In this example,the access credential may comprise information including the permissionto operate the electronic locking device 110 (i.e. electronic key 10 maystore a list of electronic locking devices it is authorized to open) aswell as the attempted time of operation. In other examples, the accesscredential may comprise only the access permission. In yet otherexamples, the access credential may comprise the access permission andinformation associated with the most recent access event recorded byelectronic key 10. Electronic locking device 110 may subsequentlycompare (e.g. utilizing a microprocessor) the access credentialtransmitted by electronic key 10 with a list of authorized accesscredentials, such as key ID codes and passwords, stored in memory of thelock. Upon proper authorization, electronic locking device 110 mayperform an unlocking operation, for example by utilizing a solenoid orelectric motor therein to displace a lock pin or blocking member.

While authentication and operation of electronic locking device 110 isillustrated herein as comprising an exchange and comparison of an accesscredential (e.g. ID code, password, and/or time of operation), it willbe appreciated by skilled persons that event handler 22 may utilize anyknown method or technique to operate and/or unlock electronic lockingdevice 110. Alternatively, if event handler 22 determines thatelectronic key 10 is not authorized to operate the engaged electroniclocking device 110 it may alert the user of the key (and potentiallypersons nearby), that the attempted operation is not authorized, forexample by actuating beeper 44 and/or LED 46.

In accordance with alternative implementations, event handler 22 mayutilize signals from accelerometer 42 to control, or otherwise alter,communications with electronic locking device 110. To illustrate, uponengagement with electronic locking device 110, event handler 22 mayinitiate an unlocking sequence (as described herein) if signals producedby accelerometer 42 indicate that electronic key 10 was subjected to aforce(s) exceeding a predetermined threshold. In other examples, eventhandler 22 may initiate an unlocking sequence if signals produced byaccelerometer 42 indicate that electronic key 10 was recently subjectedto a series of forces matching a particular pattern.

To illustrate further, event handler 22 may be configured in a defaultstate such that it will perform no action in response to an engagementevent. As described above, event handler 22 may typically respond to anengagement event by transmitting an access credential to electroniclocking device 110 or otherwise initiating an unlocking sequence withelectronic locking device 110. However, in this present example, a userof electronic key 10 may first need to subject the key to a particularforce(s), movement(s), or orientation such that signals produced byaccelerometer 42 will cause event handler 22 to perform an action orotherwise respond to an engagement event.

For instance, event handler 22 may be configured to respond to anengagement event (e.g. by transmitting an access credential or otherwiseinitiating operation and/or opening of an electronic lock) for a limitedperiod of time after signals produced by accelerometer 42 indicate aparticular force typically registered when electronic key 10 is tappedagainst a hard surface. In this example, tapping electronic key 10against a solid surface may enable event handler 22 to respond toengagement events (i.e. communicate with electronic locking device 110)for a limited period of time, such as 30 seconds. While tapping the keyagainst a hard surface is one illustration of a particular measurableforce, skilled persons will appreciate that any distinguishable force,or pattern of forces, may be utilized to selectively enable response toengagement events, for example a series of taps or a unique vibrationsequence. Skilled persons will further appreciate that enabling eventhandler 22 for limited periods of time in response to signals fromaccelerometer 42 is an example illustrating but one method or techniqueof utilizing signals produced by accelerometer 42 to further controlaccess permissions and event handler 22 may utilize other methods andtechniques. In alternative implementations, signals produced byaccelerometer 42 may be recorded or logged to a file stored in flashmemory 40 or other memory of electronic key 10. During an engagementevent, event handler 22 may initially search the file(s) containingrecorded accelerometer events to determine whether a particular force,or pattern of forces, was recently recorded, for example within theprevious 30 seconds. If the particular enabling force is indeed presentin the log of accelerometer events, event handler 22 may thereafterproceed to initiate an unlocking sequence with electronic locking device110.

In yet further implementations, event handler 22 may disable anotherwise typical default response to engagement events when particularsignals are produced by accelerometer 42. Here, event handler 22 may beconfigured such that it does not perform any action in response toengagement events for a limited period of time after signals produced byaccelerometer 42 indicate electronic key 10 was subjected to aparticular force or series of forces. In various implementations, eventhandler 22 may be configured in a default state such that it responds toengagement events by exchanging an access credential or otherwiseinitiating an unlocking sequence with electronic locking device 110.When event handler 22 receives a signal(s) produced by accelerometer 42indicative of a particular force or series of forces (e.g. exceeding apredetermined threshold), event handler 22 may deviate from this defaultstate by disabling all responses to engagement events for a period oftime, such as 10 minutes.

In this manner, event handler 22 may temporarily disable the accesscapabilities of electronic key 10 if signals produced by accelerometer42 indicate that electronic key 10 may have been forcibly taken from itsuser, for example during a physical altercation. It will be appreciatedthat other forces or patterns of forces may cause event handler 22 todisable functionality and selection of a particular force or pattern offorces may be subjective and/or may be based, for example, upon physicaland environmental forces customarily experienced by electronic key 10 ina particular access control system 100.

In accordance with various implementations, event handler 22 may controland/or communicate with various functional components of electronic key10 in response to a signal(s) produced by accelerometer 42. Forinstance, power consumption of electronic key 10 may be reduced byconfiguring event handler 22 to enable wireless communications module 30(or other functional components) in response to signals produced byaccelerometer 42 indicating movement of electronic key 10. In thismanner, power consumption of electronic key 10 may be reduced duringperiods of time when it is stationary and thus unlikely to be used.Here, wireless communications module 30 may be connected tomicroprocessor 16 via a serial peripheral interface (SPI) bus with aslave select line or other known method to allow selectiveenabling/disabling of connected peripherals. To reduce power usage,wireless communications module 30 may be disabled in a default statesuch that it consumes reduced power or zero power until enabled (e.g. itmay be disabled by holding the slave select line high in an active lowconfiguration to interrupt delivery of electrical power to wirelesscommunications module 30). Event handler 22 may thereafter selectivelyenable wireless communications module 30 by dropping the slave selectline (i.e. from logic 1 to logic 0) to deliver electrical power towireless communications module 30 in response to particular conditions.For example, in some implementations event handler 22 may enablewireless communications module 30 in response to a signal produced byaccelerometer 42 indicating movement of electronic key 10. Whileenabling/disabling of wireless communications module 30 is describedherein using a logic gate, it will be appreciated by skilled personsthat other known methods and techniques may be used such as anelectronic switch or electro-mechanical switch physically manipulated bythe user of electronic key 10. It will be further appreciated thatsimilar methods and techniques may be utilized to interrupt the supplyof electrical power to other functional components of electronic key 10in order to reduce overall power consumption.

In an alternative implementation, power consumption may be reducedfurther yet by configuring event handler 22 to selectively enablewireless communications module 30 in response to a signal produced byaccelerometer 42 indicating electronic key 10 was subjected to a forceexceeding a predetermined threshold. Here, event handler 22 may, forexample, enable wireless communications module 30 for a predeterminedperiod of time after receiving a signal(s) produced by accelerometer 42indicative of a force equivalent or greater to a force typicallyregistered when electronic key 10 is tapped or knocked against a solidsurface (i.e. tapping electronic key 10 against a desk may “wake up”wireless communications module 30 and allow establishment of a wirelesscommunications link with other electronic devices).

Referring to FIGS. 1 and 3, in accordance with various embodimentselectronic key 10 may establish a wireless communications link withelectronic devices by way of wireless communications module 30. Toillustrate, as depicted in FIG. 1, electronic key 10 communicates withmobile device 120 and/or stationary electronic device 130 via a wirelessinterface 114, for example to facilitate administration of electronickey 10 or access control system 100 via mobile device 120 and/orstationary electronic device 130. Wireless interface 114 may utilizeknown wireless communications methods and protocols including 802.11x,WI-FI DIRECT®, BLUETOOTH®, ZIGBEE®, NFC, Z-WAVE®, DECT, RUBEE® and/orother wireless communication protocols known to skilled persons. Mobiledevice 120 may be a conventional cell phone, such as that typicallycarried by most users, laptop, computer tablet, netbook computer,wearable computer device, or any mobile electronic device capable ofcommunicating via the communication protocols utilized by access controlsystem 100. Likewise, stationary electronic device 130 may be aconventional desktop computer, terminal, wall panel, kiosk, or otherfixed or semi-permanent electronic device capable of communicating viathe methods and protocols utilized by access control system 100. Thenumber and ratio of devices (e.g. electronic key 10, electronic lockingdevice 110, mobile device 120, stationary electronic device 130, etc.)depicted in FIG. 1 is intended for illustrative purposes only and is notintended to limit the implementation or arrangement of access controlsystem 100.

In some implementations, communications between electronic key 10 andmobile device 120 and/or stationary electronic device 130 may befacilitated by implementing wireless interface 114 over an ad hocInternet Protocol (IP) WLAN, for example by employing knownzero-configuration networking (ZeroConf) protocols. Alternatively,wireless interface 114 may be implemented over an IP WLAN by executing aset of instructions to configure the network settings, by manuallyconfiguring a DHCP server and DNS server, or by utilizing other knownmethods to distribute IP addresses, resolve domain names, and otherwiseconfigure network settings. In this manner, wireless communicationsmodule 30 may be utilized to implement an IP WLAN to facilitatecommunications between electronic key 10 and one or more proximate(effective range will depend on the protocol) electronic devices withoutreliance on peripheral third party communications infrastructure.Indeed, in this implementation wireless interface 114 may facilitatetransmission of information between electronic key 10 and an electronicdevice utilizing only wireless communications module 30 of electronickey 10 and compatible communications circuitry of mobile device and/orstationary electronic device 130.

While wireless interface 114 is illustrated above as being establishedover an ad hoc IP WLAN connecting two or more proximate devices, it willbe appreciated by skilled persons that other known configurations forestablishing a wireless communications link between two or moreelectronic devices may be utilized, such as a wireless personal areanetwork (WPAN), a wireless wide area network (WWAN), a wireless meshnetwork, and/or secure device pairing. It will be further appreciatedthat information in the selected configuration may be transmittedutilizing any known wireless communications protocols such as WI-FIDIRECT®, BLUETOOTH®, ZIGBEE®, NFC, Z-WAVE®, RUBEE®, WiMax (IEEE 802.16)and/or other methods and protocols known to skilled persons. It will beappreciated that communications between electronic key 10 and otherdevices (via wireless interface 114 or other methods) may optionally beencrypted according to known methods to provide enhanced security.

In other implementations, electronic key 10 may communicate with mobiledevice 120 and/or stationary electronic device 130 via a communicationnetwork 150.

Communication network 150 may be any conventional communications networksuch as a WLAN utilizing protocols such as 802.11x, well known cellularnetworks utilizing protocols conforming to the 3^(rd) GenerationPartnership Project (3GPP) specifications (e.g. GSM, UMTS, LTE),CDMA2000, or other wireless communications networks known to skilledpersons. In this implementation, wireless interface 114 may beestablished between electronic key 10 and other devices viacommunication network 150 such that electronic key 10 may exchangeinformation with any mobile device 120 or stationary electronic device130 that is similarly communicating across communication network 150,for example devices connected to a company intranet through one or morelocal area networks. It will be appreciated that mobile device 120and/or stationary electronic device 130 may communicate viacommunication network 150 by utilizing wired methods, wireless methods,or a combination thereof. Further, communication network 150 may furtherbe connected to the Internet via an Internet service provider (ISP)according to known methods such that electronic key 10 may exchangeinformation with any mobile device 120 or stationary electronic device130 that is capable of communicating across the Internet. It will beappreciated by skilled persons that electronic key 10, mobile device120, stationary electronic device 130, and other electronic devicesassociated with access control system 100 may utilize various networkingdevices to facilitate communication and exchange of information, such asa wireless access point, a router, a gateway, a switch, a bridge, a hub,a repeater, a firewall, a multiplexer, and a modem to name a fewexamples. It will be further appreciated that such networking devicesmay be embedded on the various electronic devices associated with accesscontrol system 100 (e.g. embedded on mobile device 120 and stationaryelectronic device 130), or may alternatively be located remote from suchelectronic devices and operably associated thereto utilizing the methodsand protocols described herein.

Referring again to FIG. 3, in accordance with numerous embodiments webserver 24 is a software program configured to receive and respond toelectronic data requests, such as HTTP requests (or data requests usingother application protocols known to skilled persons) from aconventional web browser. Other protocols that may have utility forsending and responding to requests in this and other embodiments arethose protocols in accordance with layer 7 of the InternationalOrganization for Standardization's Open Systems Interconnection (OSI)model. Skilled persons will appreciate that the request portion andresponse portion of an HTTP request-response transaction may be referredto as messages. HTTP is used herein to refer collectively to HTTP aswell as its secure format, HTTPS. For example, a system user or systemadministrator may utilize a conventional web browser running on mobiledevice 120 or stationary electronic device 130 to transmit an HTTPrequest message to electronic key 10 via the communication methods andprotocols described herein. The web browser may be any commerciallyavailable web browser capable of transmitting HTTP requests or otherdata requests over the Internet such as that distributed under the name“CHROME” by Google, Inc. of Mountain View, Calif., or under thetrademark FIREFOX® by Mozilla Corporation also of Mountain View, Calif.While this disclosure refers to the use of a conventional web browser toillustrate various embodiments and implementations, skilled persons willappreciate that other client applications (e.g. custom proprietaryapplications) may be used to send electronic data request messages toweb server 24.

Likewise, web server 24 may be obtained commercially and appropriateexamples include that distributed under the name “Apache HTTP Server” bythe Apache Software Foundation of Forest Hill, Md. Alternatively, webserver 24 may be a proprietary application configured to receive andrespond to electronic data requests such as HTTP request messages.Skilled persons will appreciate that software programs configured toreceive and respond to electronic data requests may often be configuredto operate as both a client (to generate and send electronic datarequest messages) and as a server (to receive and respond to electronicdata request messages) in a client-server relationship with anotherapplication. Electronic key 10 is illustrated in various embodiments ashaving a web server 24, but it should be understood that the term “webserver” is used herein for brevity and web server 24 may be any softwareprogram configured to operate as a client, as a server, or a combinationthereof. Web server 24 may cooperate with event handler 22 to process(and alternatively, to generate) data request messages. In someimplementations, event handler 22 may process a data request and preparea response message for return to web server 24 utilizing informationstored in flash memory 40 and/or non-volatile memory 20.

To illustrate by way of example, a system administrator may send an HTTPrequest message from a conventional web browser running on mobile device120 to electronic key 10 via wireless interface 114. The HTTP requestmessage may, for example, comprise instructions requesting audit trailinformation (i.e. details of previous access events) of electronic key10, or audit trail information corresponding to all keys deployed inaccess control system 100. Web server 24 handles the data request andcommunicates the information contained in the request message to eventhandler 22 to prepare a response message for transmission to the webbrowser on mobile device 120. In some implementations, event handler 22may initially authenticate the administrator (or other user initiatingthe HTTP request) prior to preparing a response message, for exampleutilizing digest access authentication or other known challenge-responseprotocols.

To illustrate further, when processing the HTTP request, event handler22 may first determine whether the requested audit trail informationexists in memory 40 and/or non-volatile memory 20. Optionally, eventhandler 22 may communicate with an embedded database server (not shown)or other file management program where files stored on electronic key 10are organized according to such architectures. If event handler 22determines that the requested audit trail information does not exist onelectronic key 10, the event handler may prepare an error message forreturn to web server 24 which in turn transmits this error message tothe web browser, for example as an HTML page or other browser compatibletext format. Alternatively, if the requested audit trail informationdoes indeed exist in memory, event handler 22 may pass this informationdirectly to the web browser via web server 24 (e.g. if the requestedinformation is stored on electronic key 10 in a static HTML document).In another implementation, event handler 22 may prepare a dynamic HTMLweb page containing the requested audit trail information for return toweb server 24 utilizing known methods and techniques such as server-sidescripting. Further, event handler 22 may cache dynamic web pages toreduce load times when responding to subsequent requests.

In yet another implementation, event handler 22 may prepare responses inXML, JSON, or other known formats suitable for transmitting informationbetween server and client. For instance, known web developmenttechniques such as Asynchronous Javascript and XML (AJAX) may beutilized in the implementation of a web application (or interactivewebpage) providing a user friendly graphical user interface (GUI)displaying access control system information and details on the webbrowser. In this manner, a user of the web browser is able to performadministration duties for an access control system using the interfaceprovided on the web browser. Here, event handler 22 may initiallyrespond to an HTTP request message by preparing a response messagecontaining static resources utilized by the web browser to build orassemble a web application. These static resources may comprise afile(s) containing various languages and formats capable of beinghandled by a conventional web browser such as HTML, JAVASCRIPT®, CSS,etc. After the web browser utilizes these static resources to build aweb application, additional asynchronous (or background) HTTP requestmessages may be generated and sent automatically from the web browser toupdate information displayed at the web application, preferably withoutreloading the page or application. For instance, after initiallydisplaying audit trail information for a particular electronic key 10 atthe web application, additional asynchronous HTTP request messages maybe sent to electronic key 10 such that any change to the audit trail ofthe key would thereafter be transmitted to the web browser toautomatically update the audit trail information displayed at the webapplication, preferably without reloading or modifying the otherresources displayed. In this implementation, event handler 22 mayprepare a response (to asynchronous HTTP request messages) containingthe requested audit trail information in JSON, XML, or other knowntextual data formats.

In further implementations, event handler 22 may create, modify, copy,replace or delete files stored in flash memory 40 or non-volatile memory20 in response to an HTTP request message. To illustrate, in anemergency situation a system administrator may send an HTTP requestmessage from a web browser on mobile device 120 to electronic key 10containing instructions to delete or otherwise disable the accesscredential(s) for that particular electronic key. In response, eventhandler 22 may delete the file(s) containing the access credential fromflash memory 40 before returning a response message comprising an HTMLpage to web server 24 (for transmission to the web browser) indicatingthat the requested action was performed successfully. In this examplewhere an access credential was deleted, the system administrator mayreprogram or otherwise provide new access permissions and/or otheraccess credential information to electronic key 10 in order tothereafter operate electronic locking device 110.

In another aspect, a system administrator may replace an obsoletefile(s) stored on electronic key 10 by utilizing a web browser or otherclient program to transmit an updated version of the file(s) along withan HTTP request message containing instructions to replace the obsoletefile(s), stored in flash memory 40 or non-volatile memory 20, with thetransmitted file. In response, event handler 22 may initiate areplacement of the obsolete file and return an HTML page (or other data)to web server 24 indicating the requested replacement was performedsuccessfully.

In a further example, a system administrator running a web applicationon a conventional web browser may send an HTTP request message toelectronic key 10 containing a request to retrieve, for display, theaccess credential for that particular electronic key. After loading thecredential information (as transmitted by electronic key 10) at the webapplication, the web application may provide the system administratorwith the ability to adjust the access credential, for example bymodifying the times during each day that electronic key 10 is authorizedfor use by a particular user. If the system administrator modifies theauthorized time frame, for example by clicking on button(s) or movingsliders within the web application's GUI to increase or decrease theauthorized time frame, the web browser may send asynchronous requestmessages to web server 24 containing instructions to modify the accesscredential accordingly. In this example, event handler 22 may respond bymodifying the file(s) containing the access credential for electronickey 10 stored, for example, in flash memory 40 before returning an XMLor JSON file containing the modified access credential information. Theweb application running on the system administrator's web browser mayprocess the XML or JSON file and appropriately update the page resources(which may be comprised of a combination of web browser compatiblelanguages and protocols including, for example, HTML, JAVASCRIPT®, CSS,etc.) in real-time such that the system administrator may view the newlymodified credential, preferably without reloading the web application orotherwise interrupting display of page resources.

According to some implementations, event handler 22 may communicate withand/or control functional components of electronic key 10 in response tomessages received at the key. For example, event handler 22 may initiatean alarm by actuating beeper 44 and/or LED 46 before returning aresponse message to web server 24. In another example, event handler 22may conserve power by disabling wireless communications module 30immediately after web server 24 successfully returns a response messageto the web browser. In yet other examples, event handler 22 maycommunicate with and/or control functional components of electronic key10 without preparing any response message to return to the web browser.

Referring here to FIG. 4, a method for modifying access credentialinformation of an electronic key 10 deployed in access control system100 will be described in accordance with at least some embodiments. Theprocess begins at step 400 and proceeds to step 402 where wirelessinterface 114 is established between electronic key 10 and mobile device120. At step 404, an HTTP request message containing instructions tomodify access credential information for electronic key 10 istransmitted from a web browser running on mobile device 120 toelectronic key 10 via wireless interface 114. Web server 24 processesthe HTTP request message and communicates the information containedtherein to event handler 22 at step 406. In step 408, event handler 22may first verify that a file(s) containing a valid access credentialexists in flash memory 40. If such a file(s) exists in memory, eventhandler 22 may proceed to step 410 where the access credential ismodified in accordance with instructions contained in the received HTTPrequest message. At step 412, notwithstanding whether the accesscredential was actually modified, event handler 22 prepares a responsemessage to pass to web server 24. Here, the response may, for example,be an HTML file containing the access credential as modified in step410. Alternatively, the response may be a file containing an errormessage where the requested modification of the access credential wasunsuccessful. At step 414, event handler 22 passes the prepared responsemessage to web server 24, which subsequently transmits the responsemessage, via wireless interface 114, to the web browser running onmobile device 120.

Power consumption during communications between electronic key 10 andvarious electronic devices may be reduced by configuring event handler22 to disable wireless communications module 30 where wireless interface114 is not established within a predetermined period of time after themodule has been enabled (i.e. if a device has not established acommunications link, or attempted to establish a communications link,with electronic key 10). In other embodiments, power consumption ofelectronic key 10 may be reduced by configuring functional components ina default low power or sleep state and thereafter selectively enablingsaid components in response to a signal(s) from accelerometer 42. Forinstance, a user of electronic key 10 may need to subject electronic key10 to a particular force or pattern of forces in order to activatefunctional components, such as wireless communications module 30. Inthis manner, a user of electronic key 10 may actively conserve power byenabling functional components only when needed, for example immediatelybefore or shortly after attempting an engagement event.

Referring now to FIG. 5, an energy efficient method for establishing awireless communications link with an electronic key will be described inaccordance with at least some embodiments. The method is initiated atstep 500 and proceeds to step 502 where event handler 22 receives asignal(s) produced by accelerometer 42 and determines what forces, ifany, electronic key 10 has been subjected to. If event handler 22determines that signals produced by accelerometer 42 indicate thatforces acting on electronic key 10 exceed a predetermined threshold instep 504, the method proceeds to step 506 where event handler 22 enableswireless communications module 30. For example, in some implementationsthe predetermined threshold may be established, in part, based on forcestypically registered when electronic key 10 is subjected to a tapping orknocking against a solid surface such as a desk. However, if eventhandler 22 determines that forces acting on electronic key 10 have notexceeded a predetermined threshold, step 502 is repeated indefinitelyuntil event handler 22 determines that forces acting on electronic key10 have exceeded a predetermined threshold. After wirelesscommunications module 30 has been enabled, event handler 22 thereafterattempts (or responds to attempts generated by other electronic devices)to establish wireless interface 114 with other devices associated withaccess control system 100 for a predetermined period of time in step508. In this step 508, event handler 22 may for example respond to arequest from a compatible communications module on mobile device 120 byattempting to establish wireless interface 114 via wirelesscommunications module 30. In other examples of step 508, event handler22 may attempt to connect to a WLAN using network credentials stored inflash memory 40. After expiration of the predetermined time in step 508,the method proceeds to step 510 where event handler 22 determineswhether wireless interface 114 has been established between electronickey 10 (via wireless communications module 30) and another device orcommunication network 150. If event handler 22 determines that wirelessinterface 114 has not been established, event handler 22 disableswireless communications module 30 in step 512. Skilled persons willappreciate that similar methods may be used to conserve powerconsumption or control behavior of other functional components. Forinstance, event handler 22 may only initiate an engagement event withelectronic locking device 110 after event handler 22 determines thatsignals produced by accelerometer 42 indicate electronic key 10 wassubject to a force exceeding a predetermined threshold.

Turning now to FIG. 6, in accordance with various embodiments, a setcomprising two or more electronic keys 10 _(a-n) deployed in accesscontrol system 100 may establish a wireless communications link with oneanother via wireless communications module 30. In this manner, eachelectronic key 10 may effectively operate as a proxy administrator ormaster key by passively updating other keys (e.g. by modifying an accesscredential with new permissions). For example, in an illustrative accesscontrol system 100, each individual electronic key 10 _(a-n) mayinitially have stored thereon (e.g. in flash memory 40) a file(s)comprising an identical access credential, or set of credentials,applicable to all electronic keys 10 _(a-n) in access control system100. The system administrator, wishing to update access permissions fora particular individual electronic key (e.g. 10 _(d)) may convenientlyestablish a wireless communications link between an electronic deviceand any available electronic key 10 _(a-n) in the system (according tomethods described herein). For example, the system administrator mayestablish wireless interface 114 between mobile device 120 andelectronic key 10 _(a) and subsequently update the access credentialcorresponding to a different electronic key, such as 10 _(d), storedthereon. Updating of the access credential may be accomplished accordingto the various methods and techniques described herein, such as forexample sending an HTTP request message containing instructions tomodify the permissions for a particular key.

The file(s) containing the newly updated access permissions, now storedon electronic key 10 _(a-n) may further contain a time stamp or otherappropriate variable to indicate the time and date that the file(s) wasmodified. Subsequently, when an administrator or user transports updatedelectronic key 10 _(a) throughout access control system 100, eventhandler 22 of electronic key 10 _(a) may selectively enable wirelesscommunications module 30 and thereafter attempt to establish wirelessinterface 114 with one or more electronic keys 10 _(a-n).

As with wireless communications between electronic key 10 and mobiledevice 120 and/or stationary electronic device 130, implementation ofwireless interface 114 between two or more electronic keys 10 _(a-n) mayutilize any appropriate wireless communications protocols such as802.11x, WI-FI DIRECT®, BLUETOOTH®, ZIGBEE®, NFC, Z-WAVE®, RUBEE®,and/or other methods and protocols known to skilled persons. Further,information may be exchanged between keys in formats identical orequivalent to those utilized when communicating with a web browser orother application on mobile device 120 and/or stationary electronicdevice 130. For instance, electronic key 10 may request information fromother electronic keys 10 _(a-n) by transmitting, via wireless interface114, an HTTP request message (or other electronic data requests known toskilled persons). An electronic key 10 receiving an HTTP request messagemay thereafter respond by transmitting information (e.g. responsemessages) via wireless interface 114 to other electronic keys 10 _(a-n)utilizing XML, JSON, HTML or other known textual data protocols.

Upon establishment of wireless interface 114 between two or moreelectronic keys, for example between electronic key 10 _(a) andelectronic key 10 _(b), event handler 22 (on either key) may initiate aninformation exchange between the keys. For example, event handler 22 onelectronic key 10 _(a) may update the access credential stored onelectronic key 10 _(b) by first requesting (e.g. transmitting an HTTPrequest message via web server 24) wirelessly connected electronic key10 _(b) transmit its access credential file(s). Event handler 22 onelectronic key 10 _(b) may respond by transmitting the file(s) via webserver 24 and wireless interface 114. Upon receipt of the accesscredential file(s), event handler 22 on electronic key 10 _(a) may run acomparison on the time stamps (or similar variable indicating time offile modification), comparing the time stamp contained in the accesscredential file(s) stored locally on electronic key 10 _(a) with thatcontained in the file(s) received from electronic key 10 _(b). If eventhandler 22 determines that the access credential file(s) transmitted byelectronic key 10 _(b) predates the access credential file(s) stored inmemory of 10 _(a-n) event handler 22 of key 10 _(a) may initiate areplacement of the outdated file by transmitting the most recent accesscredential file(s) via wireless interface 114 to electronic key 10 _(b).Thereafter, electronic keys 10 _(a) and 10 _(b) may similarly initiatecommunications with other electronic keys 10 _(a-n) such that alldeployed keys in access control system 100 receive the updated accesscredential file(s) as originally updated, by the administrator, onelectronic key 10 _(a).

Enablement of wireless communications module 30 to facilitatecommunications between electronic keys 10 _(a-n) may occur automaticallyor in response to user action. To illustrate, event handler 22 of eachelectronic key 10 _(a-n) may be configured to enable its respectivewireless communications module 30 at synchronized intermittent times,for example every 30 minutes. Alternatively, event handler 22 may enablewireless communications module 30 if a signal(s) produced byaccelerometer 42 indicates that electronic key 10 is not stationary. Inthis manner, electronic keys 10 _(a-n) may communicate with one anotherduring transportation or movement of keys throughout access controlsystem 100.

In further implementations, event handler 22 of each electronic key 10_(a-n) may enable its corresponding wireless communications module 30during synchronized time periods and thereafter attempt to establish awireless communications link via communication network 150 (not shown inFIG. 6), thus enabling all electronic keys 10 _(a-n) in access controlsystem 100 to communicate with one another irrespective of relativeproximity.

In yet further implementations, administrators or users of electronickeys 10 _(a-n) may actively induce establishment of wireless interface114 between two or more electronic keys by subjecting electronic key 10to a particular motion and/or force. To illustrate, users of twoelectronic keys deployed in access control system 100, such aselectronic key 10 _(a) and 10 _(b), may induce communications betweenelectronic keys 10 _(a,b) by tapping the two keys together. Here, eventhandler 22 (on each key 10 _(a,b)) may be configured to enable wirelesscommunications module 30 in response to a signal(s) produced byaccelerometer 42 indicating electronic key 10 was subjected to a forceexceeding or matching a predetermined threshold, such as that typicallyregistered when electronic key 10 is tapped against a solid surface.While tapping the two keys together is one example of force applied bythe user, skilled persons will appreciate that event handler 22 may beconfigured to enable wireless communications module 30 in response toany distinguishable force or motion experienced by electronic key 10. Toconserve power in various implementations, event handler 22 may beconfigured such that wireless communications module 30 is enabled for abrief period to establish wireless interface 114 between electronickeys. If wireless interface 114 is not established during this briefperiod, wireless communications module 30 may be disabled (similar tothe technique described above with reference to FIG. 5). Optionally,event handler 22 may alert users of successful and/or unsuccessfulestablishment of wireless interface 114 (and for example, success and/orfailure of subsequent communications) by actuating beeper 44 and/or LED46 such that users may reliably ascertain whether a particular key hasbeen updated with a new credential or system information.

It will be appreciated by skilled persons that electronic keys 10 _(a-n)may optionally communicate with other electronic devices in the sameautomated, or semi-automated, manner as they communicate with oneanother (i.e. where user or administrator input is limited or absent).To illustrate, electronic key 10 may be configured to operate in themanner of a client device in access control system 100, thereby allowingadministration or updating of electronic key 10 while reducing powerconsumption by operating in a client-server relationship with otherdevices. In this client-server relationship, electronic key 10 may beconfigured in a default low power (or sleep state) wherein wirelesscommunications module 30 and other functional components are disabled orotherwise consume reduced, minimal, or zero power. Here, for example,event handler 22 may periodically enable wireless communications module30 and thereafter attempt to establish wireless interface 114 with adedicated system server operating on an electronic device that isconnected to a building WLAN and located away from electronic key 10.For example, wireless interface 114 may be established while a usercarries electronic key 10 throughout various locations of access controlsystem 100. Upon establishment of wireless interface 114, event handler22 may be configured to automatically retrieve an updated accesscredential from the system server to replace or modify its own accesscredential file(s) in the same manner described above with respect tokey-to-key communications. In other implementations, event handler 22may report access events logged by the key to the system server. In thismanner, event handler 22 may automatically (e.g. without user input)manage access credentials on the key and report previous access eventsto the system server. Here, as above with respect to key-to-keycommunication, web server 24 may be a software program configured toboth generate and send electronic data request messages (e.g. HTTPrequest messages) as well as receive and respond to electronic datarequest messages. For example, in addition to being configured as aclient device (where web server 24 is typically generating requestmessages), electronic key 10 could alternatively be configured as aserver device, and a remote client device may periodically queryelectronic key 10 to retrieve access events stored thereon. In thisinstance, web server 24 would typically be responding to receivedrequest messages and communicating with event handler 22 to prepare theappropriate responses.

Referring to FIG. 7 to illustrate further, a method for automatically(e.g. without input or action from a user of the key) updating accesscontrol information of an electronic key configured to operate in aclient-server relationship with a remote server device will be describedin accordance with at least some embodiments. The method is initiated atstep 700 and proceeds to step 702 where event handler 22 enableswireless communications module 30. Depending on the arrangement andcharacteristics of the access control system 100, event handler 22 maybe configured to enable wireless communications module 30 with varyingdegrees of frequency. In some implementations of step 702, event handler22 may enable wireless communications circuitry at predeterminedperiodic intervals, such as every 10 minutes. It will be appreciatedthat the periodic intervals may vary in duration depending on thecharacteristics of access control system 100. For instance, duringcertain hours of the day the intervals may be of shorter duration tofacilitate increased control and visibility during peak access controlsystem traffic. In other implementations of step 702, event handler 22may enable wireless communications module 30 based, at least in part, onprevious access events. For instance, after electronic key 10successfully unlocks electronic locking device 110, event handler 22 mayenable wireless communications module 30 at one-minute intervals for apredetermined period of time.

After wireless communications module 30 has been enabled, the methodproceeds to step 704 where event handler 22 attempts to establishwireless interface 114 with a device associated with access controlsystem 100. According to various embodiments, event handler 22 may forexample attempt to establish wireless interface 114 with a deviceconfigured to behave as an access control information server for accesscontrol system 100. For instance, a device configured to behave as asystem server may store a master copy of access control informationassociated with all devices in access control system 100. In thisexample, an administrator or user may modify access control informationstored on the server for subsequent distribution to other devices inaccess control system 100. In this manner, the system server performsautomated updating and/or administration of client devices locatedanywhere within access control system 100 when the client devices, suchas electronic keys 10 _(a-n), “check in” with the server.

After wireless interface 114 is established in step 704, the methodproceeds to step 706 where event handler 22 initiates transmission of arequest message (e.g. HTTP) to the server device (via wireless interface114), the request message including an instruction for the server deviceto transmit, to electronic key 10, current access control information.For example, the server device may transmit the most recently modifiedaccess credential for electronic key 10. In other examples of step 706,the server device may transmit audit trail information (e.g. details ofprevious access events) associated with other keys in access controlsystem 100 to facilitate redundancy by maintaining multiple copies ofaccess control information in different locations of access controlsystem 100. In step 708, the server device transmits a response messageto electronic key 10 comprising access control information that isresponsive to the request message sent from electronic key 10 in step706. The method then proceeds to step 710 where web server 24 processesthe response message sent in step 708 and passes the access controlinformation included in the response message to event handler 22. Instep 712, event handler 22 determines whether the access controlinformation received from the server device was updated more recently(i.e. is more current) than corresponding access control informationstored in flash memory 40 of electronic key 10. For instance, where theaccess control information transmitted in step 708 includes an accesscredential for electronic key 10, event handler 22 may compare the timeof modification for the access credential stored in flash memory 40 withthat of the access credential received from the server device. If theaccess credential received from the server device was modified morerecently, the method proceeds to step 714 where event handler 22replaces (or modifies) the access credential stored in flash memory 40with the updated information received from the server device beforedisabling wireless communications module 30 in step 716. Upon completionof the method, electronic key 10 may optionally alert a user that accesscontrol information of electronic key 10 was updated or modified. Inthis manner, electronic key 10 may automatically receive updated accesscontrol information while moving throughout access control system 100and without any action or cooperation by the user of electronic key 10.This is particularly advantageous where the user of electronic key 10may prefer to avoid updating access control information, for examplewhere the electronic key 10 is lost or stolen.

In a further example, a device configured to behave as a system servermay store access control information for all electronic keys in accesscontrol system 100. Here, event handler 22 of electronic key 10 may sendan HTTP request message to the server device including an instructionfor the server device to respond with the most recent access eventsassociated with electronic key 10. In this example, upon receipt of theresponse message from the server device, event handler 22 may beconfigured to compare the access events transmitted by the server devicewith a record of access events performed by electronic key 10. If eventhandler 22 determines that electronic key 10 has performed access eventsmore recently than the access events reported by the server device,event handler 22 may transmit all access events performed by electronickey 10 to the server device (or alternatively, all access eventscompleted after a particular date and time), thereby updating at theserver device, the details of access events associated with electronickey 10.

In other implementations, a particular electronic key 10 may serve as adedicated server/administrator key, for example operating to updateother electronic keys 10 _(a-n). Event handler 22 on a dedicated serverkey may be configured such that wireless communications module 30 isuninterruptedly enabled, or enabled more often than typical keysdeployed in the system, to increase opportunities to connect with otherelectronic keys 10 _(a-n) that are configured to behave as clients.

In accordance with at least some embodiments, event handler 22 may beconfigured to operate in an emergency mode with modified behavior. Thethreshold for what constitutes an emergency may depend wholly, or inpart, on the arrangement and characteristics of access control system100. For example, event handler 22 may be configured to enter anemergency mode when a signal(s) produced by accelerometer 42 indicatesmovement of electronic key 10 exceeding a predetermined velocity orspeed (e.g. if the user of an electronic key was sprinting or operatinga vehicle when this would not be customary behavior for a user in thisparticular access control system 100). In other implementations, eventhandler 22 may be configured to enter an emergency mode if a signal(s)produced by accelerometer 42 indicates electronic key 10 has remainedstationary for an extended period of time (e.g. when the user in thisparticular access control system 100 is typically in motion).Additionally, a system administrator or user may manually instruct anelectronic key 10 to enter emergency mode via mobile device 120 and/orstationary electronic device 130, for example by utilizing a web browserto send an HTTP request message (directly to the key or to a server inperiodic communication with the key) comprising instructions to enteremergency mode.

In emergency mode, event handler 22 may be configured to temporarily orpermanently disable or revoke all access credentials for electronic key10. For instance, in emergency mode event handler 22 may be configuredsuch that it will perform no action in response to an engagement event(i.e. electronic key 10 may not operate any locking device while inemergency mode). Further, event handler 22 may automatically enablewireless communications module 30 during emergency mode such that asystem administrator or user may quickly monitor access events and/orcontrol permissions of electronic key 10. For example, a systemadministrator may utilize a web browser on mobile device 120 to send anHTTP request message containing instructions to modify or delete theaccess credential of electronic key 10 operating in emergency mode.Optionally, event handler 22 may initiate an alarm or other indicationthat electronic key 10 has entered emergency mode, for example byactuating beeper 44 and/or LED 46.

Event handler 22 may continue to operate in emergency mode for apredetermined duration. Optionally, event handler 22 may operate inemergency mode until a signal(s) produced by accelerometer 42 isindicative of a predetermined force (e.g. tapping the key twice on atable may disable emergency mode). Still further, an administrator oruser may instruct electronic key 10 to exit emergency mode for exampleby sending an HTTP request message from an application on a remotedevice such as mobile device 120.

Additional implementations of communications may be illustrated by wayof examples of emergency situations. For instance, in emergency modeevent handler 22 may be configured to enable wireless communicationsmodule 30 and thereafter uninterruptedly or periodically attempttransmission of an access credential file(s) containing masterpermissions (i.e. permission to open all access points in access controlsystem 100) to all electronic keys 10 _(a-n). In this manner, users ofthe electronic keys 10 _(a-n) receiving the master permissions maythereafter operate all access points in access control system 100 tobetter respond to the emergency. In this example, each electronic key 10_(a-n) in access control system 100 may have a master file(s) storedthereon containing an access credential with permissions to open allelectronic locking devices in the system. A master file(s) may, forexample, not be accessible by event handler 22 unless it is operating inemergency mode.

In an alternative implementation, event handler 22 of an electronic key10 operating in emergency mode may be configured to disable/revoke itsown access credential while additionally transmitting master permissionsto all other electronic keys 10 _(a-n). Further, event handler 22 may beconfigured to transmit information to other electronic keys 10 _(a-n)containing instructions to enter emergency mode.

In other examples of emergency situations, event handler 22 of anelectronic key 10 operating in emergency mode may be configured toattempt to establish wireless interface 114 between electronic key 10and a dedicated server key or dedicated system server operating on aremote device and report the emergency mode status of electronic key 10such that an administrator or other users may be alerted. The dedicatedserver key or system server may respond, for example, by revoking theaccess credential for electronic key 10 or by transmitting instructionsto enter emergency mode to all other electronic keys 10 _(a-n) deployedin access control system 100.

In yet further examples of emergency situations, where a systemadministrator or user identifies a particular electronic key 10 asstolen or otherwise being operated improperly, the administrator or usermay manually revoke the access credential for the identified key via aweb browser on mobile device 120 or stationary electronic device 130.The administrator may accomplish this by establishing wireless interface114 with the stolen key directly and updating the access permissions orother access credential information stored thereon (e.g. by sending anHTTP request message or by other methods described herein).Alternatively, where event handler 22 is configured to disable/revokethe access credential upon entering emergency mode, the administratormay simply instruct the stolen key to enter emergency mode.

In situations where a stolen or lost key is unavailable forcommunication (e.g. if the key is too distant to establish wirelessinterface 114 and/or not connected to a WLAN) an administrator or usermay disable the stolen key by utilizing key-to-key communications asdescribed above. In this example, each electronic key 10 in the set ofelectronic keys 10 _(a-n) may be configured to store, in memory, a copyof the access credential for every other key in access control system100. To illustrate further, an administrator may establish wirelessinterface 114 with any available electronic key 10 _(a-n) in accesscontrol system 100 to modify and/or revoke the access credential for thestolen key stored on the available key. For instance, where electronickey 10 _(c) was stolen, the administrator may establish wirelessinterface 114 with available electronic key 10 _(e) and thereaftermodify the access credential for stolen electronic key 10 _(c).Electronic key 10 _(e) containing the newly modified access credentialfor stolen electronic key 10 _(c) may then initiate a replacement ofobsolete access credential information stored on other electronic keys10 _(a-n) utilizing the methods described herein. The efficiency ofkey-to-key communications may be enhanced during emergency mode byconfiguring event handler 22 to increase the frequency of communicationattempts and/or to increase the frequency or duration that wirelesscommunications module 30 is enabled and available for communications.Similarly, an administrator could employ a similar method by updatingaccess credential information on a device configured to operate as asystem server in access control system 100. In this example, electronickeys 10 _(a-n) may be configured to operate as client devices,periodically exchanging messages related to access control informationwith the server device. Here, the administrator may conveniently updateaccess credential information for stolen electronic key 10 _(c) asstored on the server device (e.g. by sending an HTTP request from a webbrowser to the server device or via other methods as described herein).Thereafter, as electronic keys 10 _(a-n) periodically exchange messageswith the server device, the updated access credential information forstolen electronic key 10 _(c) will be distributed throughout accesscontrol system, eventually reaching stolen electronic key 10 _(c) andrendering it inoperative.

In accordance with various embodiments, event handler 22 can utilizesignals received via wireless communications module 30 to modifybehavior of electronic key 10, such as by selectively enabling ordisabling certain responses to an engagement event or by modifyingcommunications between electronic key 10 and electronic locking device110. For instance, wireless interface 114 can be employed to transmit asignal to electronic key 10 in order to enable electronic key 10 tooperate electronic locking device 110 (e.g. initiate communication of anaccess credential). As described elsewhere in this disclosure,electronic key 10 may have, stored in memory sites thereof, a validaccess credential associated with at least one electronic locking device110. Electronic key 10 can present the access credential to electroniclocking device 110 in order to initiate an unlocking event at thelocking device. However, in accordance with at least some embodiments,electronic key 10 can be configured such that it will not unlock oroperate electronic locking device 110 until an activation signal isreceived at the key, even where electronic key 10 otherwise possesses avalid access credential associated with the locking device. In otherwords, electronic key 10 can be configured such that a valid accesscredential and receipt or presence of an activation signal are bothrequired to enable the key to unlock at least one locking devicedeployed in access control system 100. In this manner, additionalsafeguards can be applied to circumvent unauthorized uses of electronickey 10 and electronic locking device 110. It will be appreciated that anactivation signal may, in some implementations, facilitate more exactingadministrative control over use or functionality of electronic key 10.An activation signal can be any information capable of enabling at leastone function of electronic key 10. In some implementations, anactivation signal can be utilized by a device other than electronic key10 in order to effectively limit functionality of the key. Toillustrate, electronic locking device 110 can be configured to ignore orreject attempts to initiate an unlocking sequence unless electronic key10 presents, to the locking device, information carried by an activationsignal. Various other implementations and examples will be describedbelow. It will be understood that an activation signal differs from anaccess credential in that an activation signal, by itself, will notpermit electronic key 10 to unlock electronic locking device 110.Electronic key 10 must also possess an access credential (or portionthereof). In some implementations, information carried by an activationsignal can be combined with or modify information in memory of the keyto generate a valid access credential. In other applications,information carried by an activation signal can be presented toelectronic locking device 100 in addition to an access credential (i.e.multi-factor authentication). In yet other instances, an activationsignal can be employed by event handler 22 to modify the key's responseto an engagement event. Accordingly, transmission of an activationsignal between devices in access control system 100 does not entailtransmission of an access credential or other highly sensitiveinformation that, if intercepted, could compromise security of thesystem.

In some embodiments of this disclosure, an activation signal cancomprise a portion of an access credential, whereby event handler 22 canutilize data carried by the activation signal to modify information inmemory sites of the key (e.g. flash memory 40). For example, eventhandler 22 can apply a first portion of the access credential receivedvia the activation signal to a second, remaining portion of the accesscredential stored in flash memory 40 to complete the access credentialfor subsequent transmission to electronic locking device 110. In otherembodiments, an activation signal may convey information whollyunrelated to an access credential stored in memory of electronic key 10.Here, an activation signal can comprise, to identify one example, arandomly generated binary or character string that electronic key 10presents to electronic locking device 110 (e.g. contemporaneously withan access credential). Here, event handler 22 can be configured to denytransmission of an access credential without having first received anactivation signal, or alternatively electronic locking device 110 may beconfigured to commence an unlocking sequence only where both an accesscredential and activation signal have been received from electronic key10. In various implementations, electronic locking device 110 cancompare the activation signal information presented by electronic key 10with information stored in memory sites of the locking device. Toillustrate, electronic locking device 110 may have a list of randomlygenerated binary strings stored in memory, representing potentialactivation codes. Electronic locking device 110 can compare the binarystring carried by the activation signal (and subsequently presented byelectronic key 10) with the list of activation codes stored in memorybefore determining whether to initiate an unlocking sequence. If theelectronic key 10 presents both a valid access credential and validactivation signal, an unlocking sequence can be initiated in accordancewith methods and techniques described in this disclosure. In someinstances, electronic locking device 110 may utilize a rolling codeimplementation, whereby the activation signal information presented byelectronic key 10 may only be valid for a limited period of time orlimited number of access events before the locking device advances apointer in memory or otherwise selects a new activation code from thelist of randomly generated binary strings. Skilled persons willunderstand that data other than a binary string can be conveyed by anactivation signal and used by electronic key 10 and/or electroniclocking device 110 to enable the key to cause initiation of an unlockingevent. Text files, image files, audio files, character strings, andother data capable of transmission via the protocols described in thisdisclosure may be conveyed by an activation signal in accordance withvarious embodiments.

By implementing access control system 100 such that receipt or presenceof an activation signal at electronic key 10 is required prior to thekey unlocking an entry point, surreptitious use of a key by anunauthorized individual can be further restricted in the event the keyis lost, stolen, or left unattended. For example, if electronic key 10is configured to require receipt of an activation signal from mobiledevice 120 prior to operation of electronic locking device 110, anunauthorized individual possessing a lost or stolen key will be unableto access locking devices without also having access to mobile device120 for retrieval of the activation signal. As will be understood fromthe various example implementations described in this disclosure, datacarried by an activation signal is supplemental to an access credential.Accordingly, surreptitious interception of information carried by anactivation signal will not, by itself, permit a wrongdoer to unlock oroperate electronic locking device 110. To illustrate, by utilizing datacarried by an activation signal as one component of a multi-factorauthentication (MFA) at electronic locking device 110, interception ofactivation signal data will not compromise the remaining elements of theMFA process (e.g. the access credential). Likewise, where data carriedby an activation signal is used by event handler 22 to enable keyfunctionality (e.g. enable key to transmit access credential) or tomodify access credential information stored in memory of the key,interception of the activation signal will not permit a wrongdoer toderive an access credential or otherwise operate electronic lockingdevice 110. Delivery of an activation signal can enable remoteadministration of electronic key 10 while reducing the risk thatsensitive information may be intercepted during delivery of theactivation signal, for example by eavesdropping on wireless interface114 (e.g. Bluetooth sniffing, capturing unsecured Wi-Fi signals, etc.).Accordingly, where a system administrator or other user is concernedthat a wrongdoer may eavesdrop on transmissions to electronic key 10,the key can be provided with an access credential(s) in a securelocation or via a secure communication channel, and thereafter beenabled in the field remotely via an innocuous activation signal. Inthis manner, the behavior or usage of electronic key 10 can be remotelymanaged without risking interception of an access credential by anunauthorized party; for example, where the only means of deliveringaccess control information to a remote electronic key 10 is through anunsecured wireless network. Concerns related to interception ofcommunications with electronic key 10 illustrate but one example of whenit may be appropriate to employ an activation signal to remotely enablethe key and skilled persons will recognize that an activation signal mayhave utility in other scenarios. For illustration, in some accesscontrol systems it may be desired to facilitate remote management of anelectronic key, however the access credential may be too large toeffectively transmit to a remote key using available communicationsprotocols or the credential may include information not well suited forlong-range wireless transmission.

To illustrate further, an electronic key 10 having, stored in memorysites thereof, an access credential for operation or unlocking ofelectronic locking device 110, can be configured to further requirereceipt of an activation signal prior to presenting the accesscredential to the locking device. The activation signal can betransmitted to electronic key 10 via wireless interface 114, such as inthe form of a Bluetooth signal generated by communications circuitry ofmobile device 120. The activation signal can be generated by a softwareprogram executing on mobile device 120, or generated by another devicesuch as stationary electronic device 130 and relayed to electronic key10, for instance via wireless communications circuitry of mobile device120 or via network devices operably associated with communicationnetwork 150. In other applications, mobile device 120 can receiveinformation comprising or related to an activation signal from anotherdevice, such as stationary electronic device 130, and store theinformation in memory sites of mobile device 120 for subsequenttransmission to the key. In some implementations, an activation signalcan be transmitted to electronic key 10 by stationary electronic device130 or other devices, for example via communication network 150 or otherwireless communication technologies known to skilled persons.

In accordance with certain embodiments, delivery of the activationsignal to electronic key 10 can be initiated upon (or contingent upon)the key holder performing a user verification procedure. The userverification procedure can, for example, be implemented in a mannerdesigned to verify the key holder's identity, location, or othercondition. Where mobile device 120 is configured, for example, as aconventional smartphone or cell phone, the key holder can input a PINcode on a touchscreen of mobile device 120 in order to initiate deliveryof the activation signal to electronic key 10. Here, software codeexecuting on mobile device 120 can verify accuracy of the user input,such as by verifying that the user input matches a corresponding PINcode stored in memory. Alternatively, mobile device 120 can forward theuser input to a remote device (e.g. stationary electronic device 130)for user verification; for instance, where the remote device is a systemserver configured to store and distribute access control informationassociated with various devices in access control system 100.

Skilled persons will understand that, alternatively, electronic key 10can be configured to facilitate user verification using hardware orsoftware of the key rather than, or in addition to, mobile device 120;such as by employing accelerometer 42 or other components. Similar tothe selective enabling of key functionality described above with respectto FIG. 5, signals produced by accelerometer 42 can be used to verifythe identity of a user of electronic key 10, for example by verifyingthat a user has unique knowledge of a distinctive pattern of movement.To illustrate, a user of electronic key 10 can subject electronic key 10to a particular force or pattern of forces in order to verify that anauthorized user is indeed controlling the key. Each user of accesscontrol system 100 can be assigned a distinctive pattern of forces (i.e.physical manipulation of the key) to verify his or her identity. Forexample, a key holder can verify his identity by tapping the key againsta hard surface in a particular pattern or rhythm that is known only tothe key holder (and in some cases a system administrator). Skilledpersons will appreciate that subjecting electronic key 10 to adistinctive pattern of movement is but one example of verifying keyholder identity and that other methods may have utility. For example, ifelectronic key 10 is implemented with a touchscreen, keypad, or othermeans to provide user input, a key holder can enter a secret PIN code orother private information at the key itself. Upon completion of the userverification procedure, electronic key 10 can be configured to send arequest (e.g. by automatically transmitting an HTTP request) for anactivation signal to mobile device 120 or stationary electronic device130. Mobile device 120 or stationary electronic device 130 can prepare aresponse message comprising information associated with an activationsignal for delivery to electronic key 10.

To illustrate another example, electronic key 10 can include afingerprint reader to enable collection of biometric information at thekey itself. Here, event handler 22 can be configured to requirecollection of a valid fingerprint from a key holder prior to requestingan activation signal. Alternatively, an activation signal may expireperiodically, such as every two hours, and event handler 22 can beconfigured to renew or extend expiration of the activation signal inresponse to collecting a valid fingerprint image. To illustrate, anactivation signal received at electronic key 10 can be associated withan expiration variable in memory sites (e.g. flash memory 40) of thekey. Here, collection of a valid fingerprint image at electronic key 10can extend expiration of the activation signal by modifying theexpiration variable, for example by advancing the variable by one houreach time a valid fingerprint is imaged at the reader. In certain cases,an activation signal received at electronic key 10 can be stored inmemory indefinitely and only made available (e.g. to event handler 22)upon completion of a user verification procedure at the key. Forinstance, data associated with an activation signal can be stored inmemory sites of electronic key 10. Here, the activation signal data canbe made unavailable to event handler 22 until completion of a userverification procedure. Upon completion of the user verificationprocedure, such as collection of a valid fingerprint or input of acorrect PIN code, the activation signal data can be made available toevent handler 22, for example for presentation to electronic lockingdevice 110 as part of an MFA process to initiate an unlocking sequence.In various implementations, the activation signal data can be madeavailable to event handler 22 for a limited period after completion ofthe user verification procedure, such as one day or eight hours. In someapplications, the user verification procedure at the key may only becompleted during certain times or at certain locations. For instance,event handler 22 can be configured to solicit user input (e.g.collecting a PIN code or activating a fingerprint reader) in response toengagement of electronic key 10 with electronic locking device 110. Inother instances, event handler 22 may only collect user input during akey holder's scheduled shift (e.g. 8 a.m.-5 p.m.).

Referring now to FIG. 8, in at least some embodiments, a user ofelectronic key 10 can, for instance when moving throughout or to andfrom access control system 100, carry both the key and mobile device120. User device boundary 200 illustrates the devices carried by theuser in accordance with various embodiments illustrated by FIG. 8. Itwill be appreciated that a key holder may carry other access controldevices and that the devices depicted inside user device boundary 200 inFIG. 8 are illustrative in nature. If electronic key 10 is implementedwithout hardware or software components necessary to perform the desireduser verification procedure, the user can perform the verificationprocedure at another device having the desired hardware or softwarefunctionality to facilitate the verification procedure, such as mobiledevice 120. Thereafter, mobile device 120 can be configured to initiatetransmission of the activation signal to electronic key 10 via wirelessinterface 114 in accordance with the communication protocols describedin this disclosure (e.g. Bluetooth, Wi-Fi, Wi-Fi direct, NFC, etc.).

In certain implementations, mobile device 120 can be configured tocollect and verify biometric information of a key holder, for example afingerprint or retina pattern, prior to transmitting the activationsignal. Other biometric information can be collected using known methodsand thereafter used to verify the key holder. DNA information, facialfeatures, voice characteristics, vein patterns, and other identifyinginformation may have utility in various embodiments of the userverification procedure described in this disclosure. Biometricinformation can be combined as desired with traditional forms of userinput, such as a PIN code, to provide additional confidence in verifyinga key holder. Skilled persons will appreciate that collection andverification of user information (e.g. biometric) can occurindependently of a user's control over electronic key 10. In someinstances, user verification can be triggered periodically or uponoccurrence of a particular access event. A key holder may or may not beaware that a user verification procedure has been conducted. In othercases, a user may be required to actively initiate the user verificationprocedure, for instance by pressing a button on electronic key 10 ormobile device 120, placing a fingertip on or near a fingerprint reader,causing electronic key 10 to engage electronic locking device 110,requesting access to a certain locking device (e.g. via a user interfaceof mobile device 120), or performing another specific action.

In some applications, GPS signals or other location-based data caninduce transmission of an activation signal to electronic key 10. Forinstance, mobile device 120 can be implemented as a conventionalsmartphone or other smart device with a GPS receiver capable ofreceiving signals associated with the location of the device. Skilledpersons will appreciate that a smart device can be implemented as acommercially available smartphone, tablet, or other electronic deviceproviding similar functionality. As used in this disclosure, the term“smart device” refers to a network device that is generally connected toother devices or networks and can operate to some extent interactivelyand autonomously. Examples of smart devices include smartphones (e.g.Apple iPhone, Android phones, etc.), tablets and phablets (e.g. AppleiPad, Amazon Kindle, Google Nexus, Samsung Note etc.), smart watches(e.g. Apple Watch, Samsung Gear, etc.), personal desktop computers, andlaptop computers, to identify a few specific electronic devices. Invarious aspects, verification of a user's location can trigger deliveryof an activation signal. To illustrate, GPS coordinates associated withthe location of mobile device 120 can be compared with GPS coordinatesassociated with the location of a particular electronic locking device110. Where comparison of the respective GPS coordinates indicates thatmobile device 120 is within a designated distance (e.g. twenty meters)of electronic locking device 110, an activation signal can be providedto electronic key 10, thereby enabling the key to operate or unlock theproximate locking device (assuming the key possesses a valid accesscredential for the locking device). Skilled persons will understand thatthe designated distance can be established as desired (e.g. by a systemadministrator) and may vary from system to system and even acrosslocking devices in the same system. The distance can depend, in part, onproximity of other locking devices, availability of GPS signals, thedesired level of security, and other factors. Comparison of GPScoordinates associated with mobile device 120 and electronic lockingdevice 110 can occur periodically (e.g. every fifteen seconds), ondemand (e.g. by request from the key holder or other individual), orupon occurrence of a particular event (e.g. event handler 22 detectingan engagement event), to identify a few examples.

Skilled persons will appreciate that a comparison of GPS coordinates orother location data can be performed by software code executing on anyone of multiple devices deployed in access control system 100, such asmobile device 120, stationary electronic device 130, electronic key 10,or even electronic locking device 110. To illustrate, mobile device 120may periodically compare coordinates received by a GPS receiver of themobile device with coordinates associated with a locking device. If aperiodic comparison indicates that mobile device 120 is within adesignated distance of electronic locking device 110, mobile device 120can display a button on a user interface of the device that, whenselected by the user, causes delivery of an activation signal toelectronic key 10. Alternatively, mobile device 120 can automaticallydeliver an activation signal to electronic key 10 and may alert the userof such, for example via an audible or visual signal emitted by mobiledevice 120 or by transmitting instructions to the key to actuate beeper44 and/or LED 46. Thereafter, when a periodic comparison of GPScoordinates indicates that mobile device 120 has moved beyond adesignated distance from the locking device, the button can be removedor disabled from the user interface, whereby a key holder will no longerbe able to initiate delivery of the activation signal. It will beappreciated that the user verification procedure in this exampleutilizes data other than manually entered user input. Here, a user ofelectronic key 10 may own or be issued (e.g. by a system administrator)a particular mobile device. In certain applications, it can be presumedthat a user will carry his or her mobile device or maintain a closeproximity to the mobile device at all times. Accordingly, dataassociated with a mobile device 120 owned by or issued to a key holdercan be used to indirectly verify the identity or location of the keyholder. In other words, if it is known or assumed that a key holder iscarrying his mobile device 120, GPS coordinates associated with themobile device can be used to approximate the key holder's location.

Location of the key holder (or mobile device 120) can be used as anelement (or the only element) of a user verification procedure, wherebyan activation signal is delivered to electronic key 10 only uponverifying that the key holder is within a designated distance ofelectronic locking device 110, such as 10 meters. To illustrate, if GPScoordinates associated with mobile device 120 indicate that the deviceis within close proximity to the intended electronic locking device 110,it is likely that the authorized user is also near the device and anactivation signal can be delivered to electronic key 10. In the eventelectronic key 10 is lost or stolen, an unauthorized individualattempting to use the key to open electronic locking device 110 will beunable to gain entry unless mobile device 120 (i.e. the authorized user)is within the prescribed proximity to satisfy the user verificationcriteria. Even in the unlikely event that an unauthorized individual isable to receive an activation signal at electronic key 10 (e.g. wheremobile device 120 is within range), the close proximity of theauthorized key holder (carrying mobile device 120) may facilitateidentification or apprehension of the wrongdoer. In this and otherimplementations, an unauthorized user would need to obtain control ofboth electronic key 10 and mobile device 120 in order to theoreticallygain access to a locking device, reducing the risk that a missing key,in and of itself, will compromise security of the system. Additionalsafeguards can be implemented by taking an MFA approach with the userverification procedure. For example, by prompting a user of mobiledevice 120 to provide valid user input in addition to satisfying aproximity limitation. Too illustrate, upon a GPS coordinate comparisonindicating that mobile device 120 is within the prescribed range ofelectronic locking device 110, the mobile device can prompt the keyholder to enter a PIN code or place a fingertip on a fingerprint reader.Here, delivery of an activation signal is initiated only upon a userbeing within close proximity to electronic locking device 110 andfurther providing accurate user verification credentials (i.e. a correctPIN code or fingerprint pattern). Skilled persons will understand thatlocation-based verification methods can be combined with other securityfeatures as desired. Referencing both GPS coordinates and user input,such as a PIN code, is just one example of employing MFA methodology ina user verification procedure. Other combinations and criteria can haveutility in various embodiments and implementations.

In some aspects, location-based data associated with other devices inaccess control system 100 or associated with a user of electronic key 10can be used to initiate delivery of an activation signal to the key. Toillustrate, a user can be provided with an electronic device capable ofreceiving or determining location information, for example a GPSreceiver in a smart watch worn by the user. Here, mobile device 120 (oranother device deployed in access control system 100) can acquire thelocation information from the smart watch using any of the communicationprotocols described in this disclosure. Thereafter, the locationinformation can be compared with a second set of location information,for example GPS coordinates associated with the installed location oflocking devices in access control system 100. In certain applications,software code executing on the smart watch can perform the locationcomparison. If desired, the smart watch (or similar electronic device)can be configured to provide an activation signal to electronic key 10in the same manner as described with respect to mobile device 120.Skilled persons will appreciate that a watch is but one example of awearable device that can be configured to cooperate with mobile device120 and/or electronic key 10. Other wearable devices can have utility invarious systems, for example smart glasses or other eyewear, earpiecesor headsets, athletic training bands or bracelets, communicationhardware embedded in clothing or shoes (e.g. GPS receiver), and otherwearable devices capable of communicating via the wireless protocolsdescribed in this disclosure.

In other implementations, a user verification procedure can merelyverify whether a key holder has possession of, or access to, mobiledevice 120. In such applications, a user may be required to simplyselect a button (e.g. via a touchscreen-enabled user interface) onmobile device 120 to initiate transmission of the activation signal. Incertain variations, unique information associated with mobile device120, such as a serial number or media access control (MAC) address, canbe utilized to ensure that only an authorized or intended mobile deviceis able to initiate delivery of an activation code. In otherapplications, a user can be required to touch electronic key 10 tomobile device 120, or otherwise bring the key and device into closeproximity. Here, signals produced by accelerometer 42 and signalsproduced by similar circuitry of mobile device 120 can be compared toverify proximity, for example by analyzing the similarity of forcesmeasured in each device within a brief period. Alternatively,communications circuitry of electronic key 10 and cooperative circuitryassociated with mobile device 120 can be used to exchange data (e.g.short-range communication such as a Bluetooth or NFC handshake) toverify proximity of the two devices prior to mobile device 120initiating transmission of an activation signal to the key. In thismanner, the risk of a lost or stolen key being used in an unauthorizedaccess event can be mitigated by requiring a key holder to also haveaccess to a second device, here mobile device 120.

As described above, mobile device 120 can be configured to initiatetransmission of an activation signal in accordance with variousembodiments. Mobile device 120 may, to identify a few examples, generatean activation signal, retrieve activation signal data stored in memorysites of the mobile device for transmission to the key, or instruct aremote device, such as stationary electronic device 130, to provide theactivation signal. Skilled persons will appreciate that other methodsand techniques may be employed to cause delivery of the activationsignal; in some implementations, delivery of the activation signal canoccur automatically (e.g. automatic transmission from mobile device 120or stationary electronic device 130) or upon the occurrence of aparticular event, such as an engagement event involving electronic key10 and a particular electronic locking device 110. As described abovewith respect to using location-based data for user verification,delivery of an activation signal to electronic key 10 can be contingentupon the satisfaction of multiple conditions. For instance, userverification can entail a key holder initiating engagement of electronickey 10 with a particular electronic locking device 110 or other device,and further providing valid user input or biometric information tomobile device 120. In this manner, engagement of electronic key 10 witha locking device associated with the requested activation signal canserve to verify a user's presence at the device without receiving GPSsignals or other location data. In other instances, a key holder can berequired to provide valid user input to mobile device 120 at a certaintime or location (e.g. during a particular time window or at particularGPS coordinates). In further applications, a key holder can be requiredto perform specific access events to trigger delivery of an activationsignal, such as causing engagement of electronic key 10 with aparticular sequence of locking devices. To illustrate, a systemadministrator may assign a user to a specific route, requiring the userto access a particular sequence of locking devices as the user movesthrough access control system 100. If the user accesses a locking deviceout of order or accesses a device not designated by the assigned route,delivery of further activation signals can be denied. Verification ofthe user's adherence to the assigned route can be determined, forexample, by referencing a record of access events stored in memory sitesof electronic key 10, mobile device 120, or electronic locking device110. In yet other implementations, a user can be required to satisfyseveral conditions, for example where it is desired to have strictsafeguards to minimize the risk of unauthorized key use. Here, an MFAapproach to user verification can require the key holder (or devicescontrolled by the key holder) to satisfy a number of criteria in orderto trigger delivery of an activation signal. A key holder can berequired to transport electronic key 10 and/or mobile device 120 to aparticular location (i.e. satisfy a GPS boundary), during a certain timeor day, provide valid biometric information, and further input a validPIN code before an activation code will be made available to the key.Skilled persons will understand that other criteria can be combined asdesired and that such criteria will depend, in part, on thecharacteristics of the particular access control system.

Referring again to FIG. 8, in accordance with at least some embodiments,a system administrator or other system user may wish to execute a userverification procedure and/or deliver an activation signal to electronickey 10 at a location or during a time where electronic key 10 is onlycapable of short-range wireless communication. Here, wirelesscommunications module 30 may be configured to communicate in accordancewith various known protocols via a WPAN or WLAN, for example usingBluetooth, NFC, infrared data association (IrDA), Wi-Fi, Wi-Fi Direct,or ZigBee protocols. In such circumstances, electronic key 10 may beunable to exchange access control information with a server device (e.g.a device serving access control information managed by theadministrator), such as where communication network 150 (e.g. cellularor other WWAN) is unavailable or otherwise incompatible with wirelesscommunications module 30 of electronic key 10. For instance, ifstationary electronic device 130 is configured to behave as a serverdevice, such as by executing a software program to manage and distributeaccess control information, a system administrator may modify systeminformation via a user interface at stationary electronic device 130. Asystem administrator can, for example, modify permissions for a keyholder by designating locking devices for which electronic key 10requires an activation signal. The system administrator may wish toquickly update electronic key 10 to implement the new activation signalrequirements. Here, without an available long-range communications linkbetween the server device and electronic key 10, the systemadministrator can utilize other devices, such as mobile device 120, tofacilitate remote administration of electronic key 10.

Skilled persons will understand communications circuitry of mobiledevice 120 can be utilized in various implementations to facilitateexchange of access control information between electronic key 10 and aserver device. For example, if access control system 100 is implementedsuch that a server device is responsible for verifying input collectedduring a user verification procedure, user input collected at electronickey 10 or mobile device 120 can be transmitted from the mobile device toa server device for verification. In some systems, information sent froma server device and intended for electronic key 10 can be routed throughmobile device 120 for efficiency reasons, such as where availableprotocols for communication between the server and the key are slower orunreliable. To illustrate, if wireless communication module 30 isconfigured to communicate according to at least one of an 802.11xprotocol, a Bluetooth protocol, and an NFC protocol, a key holder maytransport electronic key 10 to a remote location, such as a remoteutility or power station, where the only WWAN available is implementedusing a cellular protocol (e.g. GSM, UMTS, LTE). Here, electronic key 10may be incapable of communicating with a server device due to itsinability to utilize the available cellular network. In variousimplementations, a key holder can utilize a device (i.e. other thanelectronic key 10) capable of communicating via the available WWAN, forexample mobile device 120, to initiate and/or perform a userverification procedure and thereby cause delivery of an activationsignal to electronic key 10. For instance, where stationary electronicdevice 130 is implemented as an access control server comprising asoftware program to generate and deliver activation signals to remotedevices via the WWAN, an activation signal can first be transmitted tomobile device 120 (e.g. via an LTE cellular network where mobile device120 is implemented as a smartphone). Stationary electronic device 130can be configured to transmit activation signal data to mobile device120 via wireless interface 114, for example using LTE cellularprotocols. Mobile device 120 can then transmit the activation signal towireless communication module 30 (of electronic key 10) via wirelessinterface 114. In various implementations, the activation signal can betransmitted from mobile device 120 to electronic key 10 via knownshort-range wireless communications protocols, such as Bluetooth or NFC.Skilled persons will appreciate that various other communicationsprotocols can be utilized to provide electronic key 10 with activationsignal data. For instance, mobile device 120 and electronic key 10 canboth be connected to an available WLAN, such as an 802.11x Wi-Finetwork.

In certain aspects, the activation signal can be transmitted to mobiledevice 120 and stored in memory sites of the mobile device for a limitedperiod of time or indefinitely. In one example, both mobile device 120and electronic key 10 can be transported by a key holder to a locationwithout any available long-range communication link to a server device(such as stationary electronic device 130). Here, upon completion of auser verification procedure as described elsewhere in this disclosure,mobile device 120 can retrieve, from memory sites, informationassociated with an activation signal (e.g. information receivedpreviously from a server device) and initiate transmission to electronickey 10 via wireless interface 114, such as via a Bluetooth communicationlink. In implementations where mobile device 120 is capable ofperforming the desired user verification procedure, mobile device 120can receive access control information from a server device and storethe information in memory sites indefinitely. Thereafter, mobile device120 can, without establishing a wireless communication link with theserver device, use at least a portion of the previously received accesscontrol information to generate an activation signal for delivery toelectronic key 10. In various implementations, it is possible toinitiate delivery of activation signal data from mobile device 120 toelectronic key 10 independently of external communication networksand/or devices. For instance, if electronic key 10 and mobile device 120are transported by a key holder to a remote utility station withoutaccess to a cellular network, WLAN, or the like, mobile device 120 canretrieve activation signal data from its memory sites and transmit anactivation signal directly to wireless communication module 30.Accordingly, mobile device 120 can, in various implementations, generateand/or deliver an activation signal to electronic key 10 without accessto a WWAN or other method of long-range communication. By way of thisexample and variations thereof, a system administrator or lock owner canimplement remote activation of an electronic key 10, verifyingauthorized users of the key even at locations or during times where itis impractical to establish a real-time communication link between aserver device and devices carried by the user.

As described with respect to various examples throughout thisdisclosure, wireless communications module 30 can be configured toexchange information using multiple communications protocols. Forinstance, wireless communications module 30 can be configured toexchange information with a server device over a WLAN implemented usingan 802.11x protocol and further configured to exchange information withmobile device 120 over a WPAN implemented using a Bluetooth protocol.Wireless communications module 30 can, as described above, comprisemultiple communications chips operably linked to microprocessor 16, orwireless communications module 30 can comprise an integratedcommunications chip enabling data exchange over many different wirelessprotocols. Skilled persons will appreciate that wireless communicationsmodule 30 can include multiple antennas or utilize a single antennashared across several protocols (e.g. Wi-Fi and Bluetooth). Inimplementations where electronic key 10 may be deployed across diverseenvironments and systems, wireless communications module 30 can enablecommunications across a sizeable number of wireless protocols, forinstance 802.11x, Bluetooth, Bluetooth Low Energy (BLE), NFC, andcellular protocols. Here, wireless communications module 30 can, forexample, be configured to listen for wireless signals across numerousprotocols, exchanging information with the first available protocol. Toillustrate, wireless communications module 30 can wake-up periodicallyand listen for wireless signals across 802.11x, Bluetooth, and cellularLTE protocols. If wireless communications module 30 detects a wirelesssignal formatted according to an 802.11x Wi-Fi protocol, event handler22 may determine if electronic key 10 possesses the proper credentials(e.g. network password, if applicable) to communicate via the Wi-Finetwork. If electronic key 10 has the proper network credentials, eventhandler 22 can establish wireless interface 114 in accordance with theavailable 802.11x Wi-Fi protocol. In some instances, multiple wirelesssignals may be available for establishing wireless interface 114. Forexample, wireless communications module 30 may detect wireless signalsacross multiple protocols, such as 802.11x, Bluetooth, and Bluetooth LowEnergy. Here, event handler 22 can be configured to automaticallyselect, for example, the protocol with the highest signal strength orwith the highest maximum data rate. Alternatively, event handler 22 canbe configured to always select an 802.11x protocol if available. In someimplementations, a user can instruct electronic key 10 to utilize adesired protocol. To illustrate, electronic key 10 may be configured toexchange access control information with various devices in accesscontrol system 100 via Bluetooth protocols. Here, wirelesscommunications module 30 may be configured to automatically establishwireless interface 114 using a Bluetooth high speed protocol. For powerconsumption reasons (e.g. low battery) or other motivations, a keyholder may cause electronic key 10 to switch to a Bluetooth low energyprotocol. Here, the user can instruct wireless communications module 30to utilize a Bluetooth low energy protocol, for example via button ortouchscreen commands on electronic key 10 or, alternatively, via a userinterface of mobile device 120 which can relay the instructions toelectronic key 10. In other implementations, wireless communicationsmodule 30 may switch the default protocol in response to an event, suchas battery capacity dropping below a certain percentage. In someinstances, event handler 22 can change the default wireless protocol forwireless communications module 30 based on GPS signals received at thekey. In certain locations, electronic key 10 can be configured toutilize Bluetooth low energy protocols to establish wireless interface114, in other locations electronic key 10 may select an 802.11x protocolor NFC protocol for establishing wireless interface 114. In this manner,an administrator or key holder can configure electronic key 10 tocommunicate using different wireless protocols depending, in part, onhow the key holder wishes to utilize the key.

As described above, event handler 22 can be configured such that it willrefrain from initiating an unlocking sequence (e.g. transmitting anaccess credential) in response to an engagement event until or unless anactivation signal is received at the key, for example via wirelesscommunications module 30. In at least some implementations, eventhandler 22 can be configured to require receipt or presence of anactivation signal at electronic key 10 prior to initiating unlocking ofcertain electronic locking devices, but not require an activation signalto operate or unlock other devices in access control system 100.Similarly, certain electronic locking devices can be configured torequire MFA to initiate an unlocking device, wherein electronic key 10must present at least an access credential and activation signal data.In other implementations, event handler 22 can be configured to requirean activation signal only during particular times or on certain days. Insome applications, event handler 22 can be configured to require anactivation signal only when operating in an emergency mode. For example,where signals produced by accelerometer 42 cause event handler 22 toenter an emergency mode, event handler 22 can be configured to requirean activation signal to operate or unlock electronic locking device 100.In yet other examples, event handler 22 can be configured to alwaysrequire an activation signal prior to unlocking or operating a device(e.g. electronic locking device 110). In this manner, additionalsecurity measures can be applied to some or all devices deployed inaccess control system 100. It will be understood that the behavior ofelectronic key 10 can be configured as desired and that other conditionsor criteria can be used to determine whether an activation signal isrequired to unlock or operate a device.

Event handler 22 can be configured, in at least some implementations, toalert a key holder that an activation signal is required and/or that anactivation signal has not yet been received at electronic key 10. Forinstance, upon engagement of electronic key 10 with another device, suchas electronic locking device 110, event handler 22 can determine if therequisite activation signal has been received at the key. If theactivation signal is not present (or has expired), event handler 22 canbe configured to alert the user, for example by initiating a visual oraudible alarm via LED 46 or beeper 44. In some applications, eventhandler 22 can be configured to transmit a signal or electronic messageto mobile device 120 or other devices deployed in access control system100 to alert the key holder, system administrator, or other user of thesystem that an activation signal is required or is not present at thekey. The alert indicating an absent or invalid activation signal can,for example, be the same or similar to an alert indicating that a key isnot authorized to operate an engaged device (e.g. electronic lockingdevice 110).

Skilled persons will appreciate that an activation signal can beimplemented using various known methods and techniques. As describedabove with respect to various examples, electronic key 10 can beconfigured such that it will not initiate an unlocking sequence (e.g. bycausing transmission of an access credential) until an activation signalis received at the key. For instance, the activation signal can compriseinstructions to modify a variable referenced by event handler 22 as partof its response to an engagement event. A variable associated withreceipt of the activation signal can be configured in a default ‘false’state, indicating an activation signal has not yet been received or thata previously received signal is invalid or expired. Receipt of theactivation signal at the key causes this variable to change from thefalse state to a ‘true’ state. Event handler 22 can be configured toreference this variable in response to detection of an engagement eventand only initiate an unlocking sequence if the variable is, at the timeof reference, set to true. In various implementations, receipt of theactivation signal may change the variable to a true state for a limitedperiod of time (e.g. twenty seconds or ten minutes). To illustrate,receipt of the activation signal can, as described briefly above, modifya variable referenced by event handler 22. Event handler 22 can beconfigured to change the variable back to its pre-activation state (i.e.false) upon expiration of a period of time, such as ten minutes. Inother implementations, the activation signal may change the variable toa true state for an indefinite period of time. For instance, thevariable can remain in a true state until the occurrence of a particularaccess event triggers its change back to a false state, such ascompletion of an unlocking sequence associated with electronic lockingdevice 110 or a request initiated by a system administrator or otheruser of the system. In this manner, an activation signal can beconfigured to enable electronic key 10 for a limited period of time. Asmall window of activation (e.g. five minutes) may further reduce therisk that a lost or stolen key can be used in an unauthorized manner ata later time or date. Skilled persons will understand that modificationof a variable in memory sites of electronic key 10 is but one method oflimiting the duration that a key is enabled by an activation signal andthat other implementations may have utility. For example, the activationsignal could include information associated with an expiration timeand/or date. This expiration information can be transmitted, along withan access credential, to electronic locking device 110. Here, thelocking device can be configured to perform a comparison of theexpiration information against an internal clock of the locking device.Where the expiration information indicates an expiration time thatpredates the internal clock of the locking device, entry may be denied(even where the access credential is otherwise valid).

In accordance with at least some embodiments, the activation signal cancomprise data representing a portion of the access credential. Toillustrate, an access credential stored in memory of electronic key 10may be incomplete or otherwise invalid without access to at least aportion of the data carried by the activation signal. For example, ifelectronic locking device 110 is configured to use an access credentialcomposed of a randomly generated set of three words or characterstrings, electronic key 10 may store two of the three strings in memorysites and thereafter receive the third and final string via anactivation signal. Receipt of the activation signal at electronic key 10provides the data necessary to complete or validate the accesscredential for use with at least one device, such as electronic lockingdevice 110. In this example, event handler 22 can be configured to applythe applicable information carried by an activation signal to theincomplete access credential stored in memory sites of the key.Verification that a valid activation signal has been received atelectronic key 10 can be performed contemporaneously with authenticationof the access credential. For instance, where data carried by theactivation signal is used to complete or otherwise transform the accesscredential into a valid state, subsequent authentication of the accesscredential during engagement with electronic locking device 110effectively confirms that a valid activation signal was received at thekey.

In certain implementations, electronic locking device 110 can beconfigured such that additional information (i.e. MFA) is required toauthenticate user access during particular times or on certain dates.For instance, where electronic locking device 110 is configured toaccept an access credential, such as a randomly generated password (e.g.binary or character string), during normal business hours, the lockingdevice may require MFA to operate or unlock the device duringnon-business hours, such as requiring the key to also presentsupplementary binary data, an authorization code, or a user or key IDnumber, to identify a few examples. To illustrate, an electronic lockingdevice 110 installed on an entry point of a retail store can beconfigured to unlock in response to valid passwords transmitted byelectronic key 10 between the hours of 8 a.m. and 5 p.m. During allother hours, a user wishing to enter the store may be required totransmit a valid password and further present an access code that is,for example, only made available to supervisors or managers of thestore. In accordance with various implementations, electronic key 10 canreceive the additional information (e.g. the supervisor access code) viamobile device 120 or stationary electronic device 130 in the form of anactivation signal and thereafter present the password and supervisoraccess code to electronic locking device 110 in order to access thestore during off-hours. By providing the supervisor access code toelectronic key 10 via an activation signal transmitted by mobile device120, it is possible to reduce or eliminate the risk that a lost orstolen supervisor's key (i.e. a key with 24-hour access) can be used byan unauthorized party.

In further applications, event handler 22 can utilize informationincluded in the activation signal to perform a transformation or othermodification of an access credential prior to presenting the credentialto electronic locking device 110. In yet another example, event handler22 can be configured in a default low power or sleep state characterizedby event handler 22 wholly ignoring engagement events or simplydeclining to commence unlocking events in response to an engagementevent. In various implementations, receipt of the activation signal will“wake up” event handler 22 such that it will thereafter respond to anengagement event, such as by initiating transmission of an accesscredential. It will be understood that other implementations of anactivation signal may have utility and that the foregoing examples areprovided to aid understanding of the various embodiments of thisdisclosure.

Referring now to FIG. 9, a method for delivering an activation signal toenable an electronic key in response to a user verification procedureexecuted at a mobile device will be described in accordance with atleast some embodiments. The method is initiated at step 900 and proceedsto step 902 where a wireless communications link is established betweenmobile device 120 and a server device. The wireless communications linkcan be implemented according to any of the wireless communicationsprotocols and technologies described in this disclosure, such as a linkover a WWAN implemented in accordance with standardized cellularprotocols, or via a WLAN implemented in accordance with an 802.11xprotocol. Here, the server device can be any combination of hardware andsoftware configured to manage access control information for accesscontrol system 100. The server device can comprise or have access to anaccess control database or other repository of access controlinformation. The access control information may be managed by a systemadministrator or alternatively, users can modify access controlinformation associated with certain devices. In some implementations,stationary electronic device 130 can be configured to operate as aserver device, comprising a software program to view, manage, anddistribute access control information. In other implementations, theserver device can be implemented as a cloud service and made availableto users and administrators of access control system 100 via an Internetconnection. In yet other implementations, a second mobile device 120 canbe configured to operate as a server device, executing a softwareprogram to manage access control information for the first mobiledevice, other mobile devices, electronic keys, and the like.

Upon establishment of the wireless communications link in step 902, themethod proceeds to step 904 where information associated with anactivation signal is transmitted from the server device to mobile device120 via the wireless communications link (e.g. wireless interface 114implemented according to a standardized cellular or Wi-Fi protocol). Theinformation associated with the activation signal may depend, in part,on how the activation signal is implemented. As described above, amultitude of methods and technologies for implementing an activationsignal can have utility in various embodiments of this disclosure. Forinstance, the server device can transmit an activation code to mobiledevice 120. This code can be, for example, a randomly generated binarystring used by electronic key 10 or electronic locking device 110 duringa response to an engagement event. Alternatively, the information can besoftware code for executing an application on mobile device 120 thatcauses or enables the mobile device to transmit data to electronic key10 including instructions to modify a variable associated with theactivation signal. In other implementations, the information transmittedto mobile device 120 can identify the particular electronic lockingdevices 110 for which electronic key 10 requires an activation signal.Thereafter, mobile device 120 can generate an activation signal for theidentified locking devices and transmit the signal(s) to electronic key10. The examples of information described with respect to step 904 isprovided for illustrative purposes and is not intended to limit thescope of step 904 or the implementation of an activation signal. Otherexamples of information associated with an activation signal aredescribed elsewhere in this disclosure. Skilled persons will appreciatethat the information transmitted to mobile device 120 in step 904 can beany information used by mobile device 120 to generate, transmit, orotherwise cause delivery of an activation signal to electronic key 10.

In step 906, mobile device 120 can store, in memory sites of the mobiledevice, at least a portion of the activation signal information receivedin step 904. In certain implementations, mobile device 120 can beconfigured to store the information indefinitely. For instance, wherethe information received in step 904 causes a software application toexecute on mobile device 120, a user of the device may receive theinformation during an initial use of electronic key 10 or other devicesin access control system 100. To illustrate, where the informationreceived in step 904 comprises software code for a mobile application, auser can download the mobile application from the server device (e.g.via a mobile application store or repository) and the application (i.e.software code) may remain on the phone until the user initiates anuninstall process. In other implementations, the information can beassociated with an expiration date or the mobile device can otherwise beconfigured such that it will not use the information after a particularduration, such as one week or eight hours. Here, the user may requestthe information as needed, such as when it has expired, or theinformation can be periodically transmitted to mobile device 120according to a schedule. Skilled persons will understand that, in otherembodiments, mobile device 120 can be configured such that it is notnecessary to store the information in memory. For instance, as describedabove with respect to some implementations, mobile device 120 can beconfigured to simply relay information to electronic key 10 withoutwriting the information to memory for later use.

In step 908, a key holder causes electronic key 10 to engage withelectronic locking device 110. In this example, electronic key 10 isconfigured such that it requires an activation signal to unlock orotherwise operate the engaged electronic locking device 110. Asdescribed above, event handler 22 can be configured to perform variousresponses to an engagement event, including instances when electronickey 10 requires an activation signal to operate or communicate with anengaged device. To reiterate one of the examples described above, eventhandler 22 can, in response to detecting an engagement event betweenelectronic key 10 and electronic locking device 110, reference avariable in memory sites of electronic key 10 to determine if anactivation signal has been received at the key. In step 908 of thisexample method, an activation signal has not been transmitted toelectronic key 10. Here, event handler 22 can alert the user that anactivation signal is required and has not been received, for example viaLED 46, beeper 44, or by transmitting a signal to mobile device 120 tocause circuitry of the mobile device to alert the user. In certainimplementations, electronic key 10 can transmit instructions to mobiledevice 120 causing the mobile device to initiate a user verificationprocedure in step 910. To illustrate, electronic key 10 can transmit asignal causing mobile device 120 to prompt the key holder to enter a PINcode at the mobile device (e.g. via touchscreen input). Alternatively, asignal from electronic key 10 indicating that an activation signal isrequired may cause mobile device 120 to prompt the user for biometricinformation, such as by instructing the user to place his or her fingeron a fingerprint reader associated with the mobile device. In otherapplications, mobile device 120 may prompt the user to capture an imageof the user's face, for example via a camera operably associated withmobile device 120. Here, the image of the user's face can be compared toa previous image of the user, such as a picture taken by a systemadministrator when issuing electronic key 10. An image captured in step910 can be stored in memory sites of mobile device 120 and/ortransmitted to other devices. In this manner, a system administrator orother user reviewing access control information can visually verifywhich user requested an activation signal.

In other implementations of step 910, a signal indicating that anactivation signal is required may cause mobile device 120 to present abutton to the user that merely confirms that the user wishes to transmitan activation signal to electronic key 10 (e.g. an “ACTIVATE KEY” buttondisplayed on a touchscreen of the mobile device). In this ‘Activate Key’command implementation, the user verification procedure can simplyverify that a key holder has access to and control of mobile device 120,as opposed to requiring the user to provide secret verificationinformation. Here, for example, electronic key 10 can be configured suchthat it will only communicate with a mobile device that has previouslybeen enrolled with a system server device (e.g. via a serial number, MACaddress, etc.) or is otherwise authorized for use with devices in accesscontrol system 100. Skilled persons will understand that various knownmethods and techniques for enrolling mobile device 120 may have utilityin implementations where a mobile device must first be registered with asystem server or otherwise configured for use in access control system100. In addition to utilizing a serial number or MAC address associatedwith mobile device 120, a system server can install a softwareapplication or store software code in memory sites of the mobile devicethat, when executed, enable the mobile device to communicate with otherdevices in access control system 100. To illustrate another example, asystem server can store a code in memory of mobile device 120 that isexchanged with other devices (e.g. during a handshake or initialization)prior to transmitting access control information. Where mobile device120 does not possess the proper code, the system server and otherdevices may refuse to communicate with the mobile device. In thismanner, a lost or stolen key may not receive an activation signal froman unauthorized device, even where the user verification procedure doesnot require the user to input confidential or identifying information.In some implementations, an enrolled mobile device 120 can be configuredto automatically transmit an activation signal to electronic key 10 inresponse to an indication (e.g. signal from key) that an activationsignal is required. Here, the user verification procedure can beimplemented in a manner that simply verifies mobile device 120 is withina designated proximity of electronic key 10, such by executing awireless communication handshake or other exchange to verify the key iswithin the effective range of Bluetooth, NFC, or other short-rangecommunication protocols. Other implementations of a user verificationprocedure are described elsewhere in this disclosure and may haveutility in this step 910.

Upon completion of the user verification procedure in step 910, themethod proceeds to step 912 where it is determined whether the userverification procedure authorizes the key holder to access electroniclocking device 110. Given the diversity of methods and techniques forimplementing the user verification procedure of step 910, skilledpersons will appreciate that the criteria for establishing whether a keyholder is authorized for access will vary, based, in part, on theimplementation of a particular user verification procedure. Forinstance, if a user verification procedure is implemented in a mannerintended to verify proximity of electronic key 10 to mobile device 120,a successful NFC or Bluetooth handshake (i.e. pairing between devices orestablishing a communications link) between the two devices may satisfythe criteria necessary to authorize the key holder. Similarly, where theuser verification procedure is implemented as an “ACTIVATE KEY” command(or similar button press verification) on a touchscreen or other inputdevice associated with mobile device 120, a successful selection of thebutton by a user may be sufficient to authorize the key holder to accesselectronic locking device 110. In some cases, failing to press thebutton within a prescribed period may be considered an unsuccessful userverification procedure, wherein mobile device 120 will not transmit anactivation signal to electronic key 10. Where the user verificationprocedure in step 910 requires the user to provide identifying orprivate information, such as a PIN code or biometric information, thecriteria for authorizing transmission of an activation signal mayrequire a perfect match. In other words, information provided by theuser and corresponding reference information stored in memory sites ofmobile device 120 or stored remotely (e.g. in the cloud or a remotedevice) must be indistinguishable. Alternatively, the criteria for auser verification procedure may factor in a margin for error, or mayonly require a partial match between user input (e.g. PIN, biometric,etc.) and reference information stored in memory (e.g. fingerprintprofile associated with key holder). Skilled persons will appreciatethat the user verification procedure of step 910 and the determinationof what criteria constitutes a successful user verification may varyfrom system to system and that methods and techniques other than thosedescribed in the examples above can have utility in access controlsystem 100.

The process of determining whether the user verification procedureauthorizes delivery of an activation signal can be executed at mobiledevice 120, electronic key 10, electronic locking device 110, a remotedevice, such as stationary electronic device 130 (e.g. where stationaryelectronic device 130 is configured as a server device managing accesscontrol information for the system), or a combination of devices. Forinstance, software code executing on a device associated with accesscontrol system 100 can be configured to perform a comparison orotherwise verify the accuracy of information collected in step 910. Toillustrate further, mobile device 120 can store a key holder profile inmemory sites and reference information contained in the profile whendetermining if a user verification procedure is successful, for instanceby executing software code to compare a PIN code provided by a user instep 910 with a PIN code stored in memory and associated with that user.In this manner, mobile device 120 can, in locations where long-rangewireless communication with a server device is unavailable, facilitateexecution of the user verification procedure and additionally determineif the procedure was successful.

In other implementations, mobile device 120 can transmit the user input,or other information collected during the user verification procedure,to another device to determine whether the user verification procedurepermits delivery of an activation signal to electronic key 10. Here,mobile device 120 can, for instance, transmit the user verificationinformation obtained in step 910 to electronic key 10. Event handler 22can be configured to compare information collected in step 910 withinformation associated with a key holder (e.g. stored in flash memory 40of electronic key 10). If event handler 22 determines that an activationsignal should be delivered, for example by determining that a PINentered by the user is correct, a request (e.g. HTTP) can be transmittedfrom electronic key 10 to mobile device 120 requesting an activationsignal. Mobile device 120 can prepare a response message including anactivation signal for transmission to electronic key 10 according tocommunication methods and techniques described in this disclosure. Inother embodiments, mobile device 120 can transmit the informationcollected in step 910 to a remote server device via wireless interface114, for example using a standardized cellular protocol. Thereafter, theserver device can determine if the information authorizes delivery of anactivation signal, such as by executing software code to compare theuser verification information collected in step 910 to informationassociated with the user or information associated with devicescontrolled by the user (e.g. mobile device 120 or electronic key 10).Here, the server can wirelessly transmit an activation signal directlyto electronic key 10 according to the methods and protocols described inthis disclosure, or alternatively, route the activation signal throughanother device, such as mobile device 120 or a network communicationdevice (e.g. router or mesh network). The foregoing examples identifyjust a few possible techniques for determining whether the user ordevice information collected in the user verification procedure of step910 authorizes delivery of an activation signal. Skilled persons willappreciate that the wireless communications capability of the variousdevices described in this disclosure permit a multitude of methods andtechniques for verifying the accuracy or validity of the informationcollected in step 910. Other methods and techniques may have utilitydepending on the criteria chosen for the user verification procedure ofstep 910.

If a user verification procedure does not authorize delivery of anactivation signal (e.g. incorrect user input, failed wirelesscommunication handshake between key and mobile device), the method canproceed to step 914 where details related to the failed userverification procedure are recorded in memory sites of at least one ofmobile device 120, electronic key 10, electronic locking device 110, anda server device (i.e. remote or cloud). In some instances, a failed userverification can trigger an alarm or initiate delivery of a warningmessage to a remote device. To illustrate, if mobile device 120determines that a user verification procedure is unsuccessful, mobiledevice 120 can transmit a message to a server device (e.g. stationaryelectronic device 130) to alert a system administrator of the faileduser verification. In certain implementations, this step 914 mayconclude the method. Alternatively, the method can return to step 910and reinitiate the user verification procedure. In returning to step910, the method can account for accidental entry of inaccurate userinput, or a misread of biometric information, or other errors in theuser verification procedure that may result in a false negative. In somevariations, the method can permit a key holder to attempt a limitednumber of user verification procedures before terminating the method. Insome instances, a failed user verification procedure(s) can initiate asafe mode to prevent unauthorized use of electronic key 10, whereincertain features of electronic key 10 and/or mobile device 120 aredisabled or unavailable to the user. To illustrate an example, where theuser verification procedure in step 910 is implemented such that a keyholder must enter a valid PIN code at mobile device 120 or electronickey 10, the method can permit the user a limited number of attempts,such as three, in which to correctly enter the PIN code. In thisexample, upon entering an incorrect PIN code three times within aprescribed period, such as ten minutes, the user will be prevented fromattempting further user verification procedures. Mobile device 120 orelectronic key 10 can be configured to transmit a message to a serverdevice, such as stationary electronic device 130, indicating that safemode has been entered and functionality is limited. This alert can allowa system administrator to quickly contact a key holder to determine if akey has been lost or stolen. In order to regain access to the userverification procedure or to otherwise request an activation signal, theuser may need to obtain permission from an administrator, wait for anextended period of time, or perform a different (i.e. more rigorous)user verification procedure to verify the user is indeed authorized tooperate electronic key 10 in the requested manner.

If it is determined, in step 912, that the user verification procedureauthorizes delivery of an activation signal to electronic key 10, themethod can proceed to step 916 where an activation signal is transmittedto electronic key 10. As described above, delivery of an activationsignal can be implemented in various ways and can be transmitted fromvarious devices associated with access control system 100. Delivery ofthe activation signal to electronic key 10 in step 916 enables access toelectronic locking device 110, as described in greater detail elsewherein this disclosure. Upon completion of the method, mobile device 120and/or electronic key 10 can record information related to delivery ofthe activation signal in memory sites, such as the time, date, identifyof the locking device(s) for which the signal was requested, user inputcollected in step 910 such as a fingerprint pattern or image of theuser's face or portion thereof, and other information that may begenerated or used during execution of this method. In someimplementations, mobile device 120 can be configured to transmitinformation associated with delivery of the activation signal to aremote device, such as a server device (e.g. stationary electronicdevice 130). In this manner, real-time or near real-time feedbackrelated to activation of electronic key 10 can be viewed remotely, forexample via a user interface at stationary electronic device 130 or anydevice configured to communicate with mobile device 120 and/or theserver device (e.g. via communication network 150).

In certain embodiments, wireless communications module 30 can beconfigured to receive a deactivation signal to disable certainfunctionality of electronic key 10, for example using methods andtechniques similar to those described above for enabling functionalitywith an activation signal. To illustrate, a key holder or systemadministrator may wish to deactivate certain functions of electronic key10 if it is anticipated that the key will be left unattended for anextended period, such as at the end of a key holder's work shift. Invarious implementations, a deactivation signal can be transmitted toelectronic key 10 in order to place the key in a state characterized byat least one function being disabled or unavailable to a key holder. Adeactivation signal can, to identify a few examples, cause electronickey 10 to enter a sleep or low-power state, disable key communicationswith some or all devices, or disable responses to an engagement event,such as by flipping an activation signal variable from a true state backto a false state. In accordance with some implementations, upon receiptof a deactivation signal, electronic key 10 can be configured to disablethe function(s) until receipt of an activation signal that includesinstructions to restore the function(s), or alternatively, functionalitymay be restored after a designated time period, in accordance with a keyholder schedule, or upon occurrence of a particular access event, suchas engagement with a certain electronic locking device. Other conditionsor events can be used to restore key function after receipt of adeactivation signal. In some instances, completion of a userverification procedure, such as imaging of a valid fingerprint, cantrigger restoration of key functions. Skilled persons will understandthat any of the methods and techniques described above with respect toutilizing or initiating transmission of an activation signal cansimilarly be used in connection with a deactivation signal to limitfunctionality of the key. To illustrate one example, in an emergencysituation a system administrator can, via a user interface associatedwith a server device (e.g. stationary electronic device 130), initiatetransmission of a deactivation signal to prevent a key holder fromentering a dangerous room or location. The deactivation signal may bedelivered to electronic key 10 via communication network 150 or othercommunications technologies described in this disclosure or known toskilled persons. In the event an appropriate wireless communicationslink between the server device and electronic key 10 is unavailable, thedeactivation signal can be delivered to mobile device 120 for subsequenttransmission to the key.

Any reference in this disclosure to “one embodiment,” “an embodiment,”“some embodiments,” “various embodiments,” etc., means that a particularfeature, structure, or characteristic described in connection with theembodiment is included in at least one embodiment of this disclosure.The appearances of such phrases, and variations thereof, includingreferences to “implementations,” are not necessarily all referring tothe same embodiment or implementation. When a particular feature,structure, or element is described in connection with any embodiment orimplementation, it is understood that it is within the purview ofpersons of skill to affect such feature, structure, or element inconnection with any of the other embodiments and implementations.

It should be understood that as used in this disclosure and throughoutthe claims that follow, the phrase “A or B” means any one of (A), (B),or (A and B), which is synonymous with the phrase “A and/or B.”Alternatively, just a “/” may be use for conciseness. For example, thephrase “A/B” also means “A or B.” The phrase “at least one of A, B, andC” means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, andC). Further, as used in this disclosure and throughout the claims thatfollow, the meaning of “in” includes “in” and “on” unless the contextclearly prescribes otherwise. The terms “comprising,” “having,” and“including” are synonymous, unless the context dictates otherwise. Asused in this disclosure, the terms “conveying” and “carrying” aredescribed with reference to information included in a communicationsignal and are synonymous, unless the context dictates otherwise.

Although embodiments have been described with reference to a number ofillustrative embodiments and implementations thereof, it will beappreciated that numerous other modifications and embodiments can bedevised by skilled persons without departing from the spirit and scopeof the underlying principles of this disclosure. The scope of thisdisclosure should, therefore, be determined only by the followingclaims.

It is claimed:
 1. A portable electronic key for unlocking an entry pointsecured by an electronic locking device, the portable electronic keycomprising: one or more processors; and memory storing instructionsthat, when executed by the one or more processors, cause the portableelectronic key to: receive, from an access administration device via awireless communication network, access control information comprisingfirst authentication information associated with the electronic lockingdevice; determine, based on a location of the portable electronic key,whether the portable electronic key is located within a thresholddistance to the electronic locking device; receive, from the accessadministration device and based on the determination that the portableelectronic key is located within the threshold distance, access controlinformation comprising second authentication information associated withthe electronic locking device, the second authentication informationdifferent from the first authentication information; and initiate, basedon the first authentication information and the second authenticationinformation, delivery of an unlocking signal to the electronic lockingdevice, the unlocking signal conveying an access credential that causesthe electronic locking device to unlock the entry point.
 2. The portableelectronic key of claim 1, wherein the first authentication informationcomprises the access credential.
 3. The portable electronic key of claim1, wherein the access credential comprises at least a portion of thefirst authentication information and the second authenticationinformation.
 4. The portable electronic key of claim 1, wherein thefirst authentication information defines a first time period duringwhich the portable electronic key is permitted to initiate delivery ofthe unlocking signal, and wherein the second authentication informationdefines a second time period during which the portable electronic key ispermitted to initiate delivery of the unlocking signal, the second timeperiod different from the first time period.
 5. The portable electronickey of claim 4, wherein the instructions, when executed by the one ormore processors, cause the portable electronic key to initiate deliveryof the unlocking signal based on a comparison of the first time periodand the second time period.
 6. The portable electronic key of claim 4,wherein the instructions, when executed by the one or more processors,cause the portable electronic key to initiate delivery of the unlockingsignal based on a third time period, the third time period correspondingto an overlap of the first time period and the second time period. 7.The portable electronic key of claim 1, wherein the wirelesscommunication network is a wireless local area network (WLAN) or awireless wide area network (WWAN).
 8. The portable electronic key ofclaim 1, wherein the wireless communication network is selected from thegroup consisting of a wireless personal area network (WPAN), a wirelessmesh network, and a wireless ad hoc network.
 9. The portable electronickey of claim 1, wherein the access administration device is a mobiledevice selected from the group consisting of a smartphone, a tabletcomputer, a laptop computer, and a wearable computing device.
 10. Theportable electronic key of claim 1, wherein the instructions, whenexecuted by the one or more processors, cause the portable electronickey to determine the location based on the portable electronic keycommunicatively coupling with the electronic locking device.
 11. Theportable electronic key of claim 1, wherein the instructions, whenexecuted by the one or more processors, cause the portable electronickey to determine the location based on Global Positioning System (GPS)data associated with the key.
 12. The portable electronic key of claim1, wherein the instructions, when executed by the one of moreprocessors, cause the portable electronic key to determine the locationbased on the portable electronic key receiving one or more electronicmessages from a proximate access control device, the electronic messagesreceived via a wireless local area network (WLAN) or a wireless personalarea network (WPAN).
 13. A method of facilitating access to a securedentry point, the method comprising: receiving, by a portable electronickey and from a first access administration device, access controlinformation including first authentication information associated withan electronic locking device, the electronic locking device configuredto restrict access to the secured entry point; determining, based onlocation information associated with the portable electronic key,whether the portable electronic key is located within a thresholddistance to the electronic locking device; based on the portableelectronic key being located within the threshold distance, receiving,by the portable electronic key and from a second access administrationdevice, access control information including second authenticationinformation, the second authentication information different from thefirst authentication information; and transmitting, by the portableelectronic key and based on the first authentication information and thesecond authentication information, an unlocking signal that causes theelectronic locking device to permit access to the secured entry point.14. The method of claim 13, wherein the unlocking signal conveys anaccess credential associated with the electronic locking device, theaccess credential corresponding to at least a portion of the firstauthentication information.
 15. The method of claim 13, wherein thedetermining whether the portable electronic key is located within thethreshold distance to the electronic locking device comprises detecting,by a communications interface of the portable electronic key, acommunication from the electronic locking device.
 16. The method ofclaim 13, wherein the portable electronic key is configured tomechanically couple with the electronic locking device, and wherein theunlocking signal is transmitted via an electrical connection between theportable electronic key and the electronic locking device.
 17. Themethod of claim 13, wherein the first authentication informationcomprises a first time period during which the key is permitted toaccess the entry point, and wherein the second authenticationinformation comprises a second time period during which the key ispermitted to access the entry point, the second time period differentfrom the first time period.
 18. The method of claim 17, wherein thetransmitting of the unlocking signal is based on a third time period,the third time period corresponding to an overlap of the first timeperiod and the second time period.
 19. A non-transitorycomputer-readable storage medium comprising instructions that, whenexecuted by one or more processors of a portable electronic key, causethe portable electronic key to: receive, from an access administrationdevice, access control information including first authenticationinformation associated with an electronic locking device, the electroniclocking device configured to restrict access to an entry point;determine, based on location information associated with the portableelectronic key, whether the portable electronic key is located within athreshold distance to the electronic locking device; receive, from theaccess administration device, access control information includingsecond authentication information associated with the electronic lockingdevice, the second authentication information different from the firstauthentication information; and initiate, based on the firstauthentication information and the second authentication information,transmission of an access credential that causes the electronic lockingdevice to permit access to the entry point.
 20. The non-transitorycomputer-readable storage medium of claim 19, wherein the accesscredential corresponds to at least a portion of the first authenticationinformation, and wherein the second authentication information defines atime period during which the portable electronic key is permitted toaccess the entry point.